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#include <cstdio>
using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define INT(x) int x; scanf("%d", &x)
#define STR(n,x) char x[n]; scanf("%s", x)

bool ok[10];

int main() {
	INT(n);
	STR(101, a);
	REP(i,10) ok[i] = 1;
	int t = n / 10;
	REP(i,n) if (a[i] == 'N') ok[i / t] = 0;
	int r = 0;
	REP(i,10) r += ok[i];
	printf("%d\n", r);
}