#include <cstdio>
#include <cstring>

using namespace std;

typedef long long ll;

const int N = 100010;

int n, q;
char s[N];
int cnt[N][26];

int main() {
    int t;
    scanf("%d", &t);
    for (int cs = 1; cs <= t; ++cs) {
        printf("Case #%d:\n", cs);
        scanf("%d%d", &n, &q);
        scanf("%s", s + 1);
        memset(cnt, 0, sizeof(cnt));
        for (int i = 1; i <= n; ++i)
            cnt[i][s[i] - 'A'] = 1;
        for (int i = 1; i <= n; ++i)
            for (int j = 0; j < 26; ++j)
                cnt[i][j] += cnt[i - 1][j];
        while (q--) {
            int l, r;
            scanf("%d%d", &l, &r);
            for (int i = 0; i < 26; ++i)
                if (cnt[r][i] - cnt[l - 1][i]) {
                    printf("%d\n", cnt[r][i] - cnt[l - 1][i]);
                    break;
                }
        }
    }
    return 0;
}