#include <stdio.h>

int n, m;
char s[100001];
int us[100000], vs[100000];
long long f[100000];

int main() {
    scanf("%d %d %s", &n, &m, s);
    for (int i = 0; i < m; i++) {
        scanf("%d %d", us + i, vs + i);
        us[i]--;
        vs[i]--;
        if (s[us[i]] == 'P' && s[vs[i]] == 'D') f[vs[i]]++;
        if (s[vs[i]] == 'P' && s[us[i]] == 'D') f[us[i]]++;
        if (s[us[i]] == 'C' && s[vs[i]] == 'A') f[us[i]]++;
        if (s[vs[i]] == 'C' && s[us[i]] == 'A') f[vs[i]]++;
    }
    long long ans = 0;
    for (int i = 0; i < m; i++) {
        if (s[us[i]] == 'D' && s[vs[i]] == 'C') ans += f[us[i]] * f[vs[i]];
        if (s[vs[i]] == 'D' && s[us[i]] == 'C') ans += f[vs[i]] * f[us[i]];
    }
    printf("%lld\n", ans % 1000000007);
}