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//Uch...
//Please, work...

#include <cstdio>
#include <vector>

// #define DEBUG
#define ERRSTREAM stderr

using namespace std;

const int MAXN=1000005;
const long long INF=1000LL*1000*1000*1000*1000*1000 + 1234;
const int INT_INF = 1000*1000*1000;
const int OFFSET=3000000;

typedef long long LL;


LL N, M;
int savings[MAXN] = {};
int machine[MAXN] = {};


bool done[MAXN]={};

int memory[2*OFFSET]={};
int maxH, minH;
LL record = INF;

void resetMemory() {
	minH=1;
	maxH=-1;
}

void saveWhenWillBeHeight(int height, int step) {
	memory[height+OFFSET]=step;
	maxH=max(maxH, height);
	minH=min(minH, height);
}

int getWhenWillBeHeight(int height) {
	if (!(minH <= height && height <= maxH))
		return INT_INF;
	
	return memory[height+OFFSET];
}

void updateRecord(long long answer) {
	if (record > answer)
		record = answer;
}


int step;
int cycLen;
int cycSum;
int cycMin;
int height;

void processBoyUsingCurCycleData(int boyInd) {
	done[boyInd]=true;
	
	long long answer;
	int when;
	
	when = getWhenWillBeHeight(height-savings[boyInd]);
	
	#ifdef DEBUG
		fprintf(ERRSTREAM, "######################################\n");
		
		fprintf(ERRSTREAM, "height=%d\n", height);
		fprintf(ERRSTREAM, "savings[%d]=%d\n", boyInd, savings[boyInd]);
		fprintf(ERRSTREAM, "step=%d\n", step);
	#endif
	
	if (when != INT_INF) {
		answer = 1 + boyInd + (LL)(when-step-1)*N;
		
		#ifdef DEBUG
			fprintf(ERRSTREAM, "when=%d\n", when);
			fprintf(ERRSTREAM, "Boy %d loses in first round\n", boyInd);
			fprintf(ERRSTREAM, "answer = %lld\n", answer);
		#endif
		
		updateRecord(answer);
		return;
	}
	
	if (cycSum >= 0) {
		//Will never bankrupt
		return;
	}
	
	int cycles, rest;
	
	//Dirty 5am fix:
	int metaRest = height-minH;
	int metaCycles = (savings[boyInd]-metaRest)/(-cycSum);
	if (metaCycles * (-cycSum) == savings[boyInd]-metaRest) {
		cycles = metaCycles;
		rest = metaRest;
	} else {
		cycles = metaCycles+1;
		rest = savings[boyInd] + cycles*cycSum;
	}
// 	int cycles = savings[boyInd]/(-cycSum);
// 	int rest = savings[boyInd] + cycles*cycSum;

	if (rest==0) {
		--cycles;
		rest=(-cycSum);
	}
	
	when = getWhenWillBeHeight(height-rest);
	
	
	answer = 1 + boyInd + (LL)(when-step-1)*N + cycles*(LL)(cycLen)*N;
	
	#ifdef DEBUG
		fprintf(ERRSTREAM, "when=%d\n", when);
		fprintf(ERRSTREAM, "Boy %d loses in %d cycle.\n", boyInd, cycles+1);
		fprintf(ERRSTREAM, "cycles=%d\n", cycles);
		fprintf(ERRSTREAM, "rest=%d\n", rest);
		fprintf(ERRSTREAM, "cycLen=%d\n", cycLen);
		fprintf(ERRSTREAM, "cycSum=%d\n", cycSum);
		fprintf(ERRSTREAM, "answer = %lld\n", answer);
	#endif
	
	updateRecord(answer);
}

void processCycle(int boyInd) {
	if (done[boyInd] == true)
		return;
	
	resetMemory();
	
	long long curInd = boyInd+N*M;
	step=0;
	cycLen=0;
	cycSum=0;
	cycMin=0;
	height=0;
	
	#ifdef DEBUG
		fprintf(ERRSTREAM, "save: curInd%%M=%lld, height=%d, step=%d\n", curInd%M, height, step);
	#endif
	
	saveWhenWillBeHeight(height, step);
	
	//First pass, gathering data:
	do {
		++cycLen;
		cycSum = cycSum + machine[curInd%M];
		
		curInd-=N;
		height -= machine[curInd%M];
		--step;
		
		#ifdef DEBUG
			fprintf(ERRSTREAM, "save: curInd%%M=%lld, height=%d, step=%d\n", curInd%M, height, step);
		#endif
		
		saveWhenWillBeHeight(height, step);
		
		
	} while (curInd%M != boyInd%M);
	
	curInd=boyInd+N*M;
	
	do {
		for (int i=curInd%M; i<N; i+=M)
			processBoyUsingCurCycleData(i%N);
		
		curInd-=N;
		height -= machine[curInd%M];
		--step;
		
		#ifdef DEBUG
			fprintf(ERRSTREAM, "save: curInd%%M=%lld, height=%d, step=%d\n", curInd%M, height, step);
		#endif
		
		saveWhenWillBeHeight(height, step);
		
	} while (curInd%M != boyInd%M);
}


int main() {
	scanf("%lld ", &N);
	
	for (int i=0; i<N; ++i) {
		scanf("%d ", &savings[i]);
	}
	
	scanf("%lld ", &M);
	
	char c;
	for (int i=0; i<M; ++i) {
		scanf("%c", &c);
		
		if (c=='W')
			machine[i]=1;
		else if (c=='P')
			machine[i]=-1;
		else {
			fprintf(ERRSTREAM, "Error while reading: unrecognized character with code: %d\n", (int)(c));
			return 1;
		}
	}
	
	for (int i=0; i<N; ++i) {
		processCycle(i);
	}
	
	if (record == INF)
		printf("-1\n");
	else
		printf("%lld\n", record);
	
	return 0;
}