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#include <cstdio>
#include <algorithm>
#include <deque>
#include <cmath>
using namespace std;

typedef long long ll;
#define pb push_back
#define si size()
#define lf(x) ((x)<<1)
#define ri(x) (lf(x)+1)

const int maxn=1000010;

deque<int> L[maxn];
int T[maxn*3];
int a[maxn];
int b[maxn];
char s[maxn];
bool vis[maxn];

ll MIN(ll a, ll b){
    if(b<0)
        return a;
    if(a<0)
        return b;
    return min(a, b);
}

int tSize(int n){
    if(n&(n-1)){
        frexp(n, &n);
        n=1<<n;
    }
    return n;
}

void addValue(int x, int v, int s){
    if(T[x+s])
        L[x].pb(v);
    else{
        x+=s;
        T[x]=v;
        while(x>>=1)
            T[x]=max(T[lf(x)], T[ri(x)]);
    }
}

void eraseValue(int x, int s){
    if(L[x].empty())
        T[x+s]=0;
    else{
        T[x+s]=L[x][0];
        L[x].pop_front();
    }
    x+=s;
    while(x>>=1)
        T[x]=max(T[lf(x)], T[ri(x)]);
}

int query(int a, int b){
    int m=0;
    while(a<b){
        if(a&1) m=max(m, T[a++]);
        if(!(b&1)) m=max(m, T[b--]);
        a>>=1;
        b>>=1;
    }
    if(a==b)
        m=max(m, T[a]);
    return m;
}

int findLast(int s){
    if(!T[1])
        return -1;
    int x=1;
    while(x<s){
        x=ri(x);
        if(!T[x])
            --x;
    }
    return x-s;
}

ll processPlayer(int j, int a, int n, int m, int s, int l, int vsi, int p, int i){
    int r=query(a+s, l+s);
    if(r) return ll(vsi-r-i)*n+j+1;
    if(p<=0)
        return -1;
    r=findLast(s);
    if(r<0)
        return -1;
    r=(a-r)/p;
    a-=p*r;
    ll res=(ll)r*l*n;
    r=vsi-query(a+s, l+s);
    res+=ll(r-i)*n+j+1;
    return res;
}

ll processPeriod(int u, int n, int m){
    deque<int> V;
    deque<int> P;
    while(!vis[u]){
        V.pb(u);
        vis[u]=1;
        u=(u+n)%m;
    }
    int l=V.si;
    int s=tSize(l+1);
    for(int i=0;i<l;++i)
        V.pb(V[i]);
    P.pb(b[V[0]]);
    for(int i=1;i<V.si;++i)
        P.pb(P[i-1]+b[V[i]]);
    for(int i=0;i<l-1;++i)
        if(P[i]>=0)
            addValue(P[i], V.si-i, s);
    ll res=-1;
    for(int i=0;i<l;++i){
        if(P[i+l-1]>=0)
            addValue(P[i+l-1], V.si-i-l+1, s);
        for(int j=V[i];j<n;j+=m)
            res=MIN(res, processPlayer(j, a[j]+((i>0)?P[i-1]:0), n, m, s, l, V.si, P[l-1], i));
        if(P[i]>=0)
            eraseValue(P[i], s);
    }
    for(int i=l;i<V.si;++i)
        if(P[i]>=0)
            eraseValue(P[i], s);
    return res;
}

int main()
{
    int n, m;
    scanf("%d", &n);
    for(int i=0;i<n;++i)
        scanf("%d", a+i);
    scanf("%d%s", &m, s);
    for(int i=0;i<m;++i)
        b[i]=(s[i]=='P')?1:-1;
    ll ans=-1;
    for(int i=0;i<m;++i)
        if(!vis[i])
            ans=MIN(ans, processPeriod(i, n, m));
    printf("%lld", ans);
}