#include <bits/stdc++.h>
using namespace std;
const int maxn = 100005;
int T, n, q;
char s[maxn];
int pcnt[maxn][26];
int main() {
    scanf("%d", &T);
    for (int kase = 1; kase <= T; ++kase) {
        printf("Case #%d:\n", kase);
        scanf("%d%d", &n, &q);
        for (int i = 1; i <= n; ++i) for (int j = 0; j < 26; ++j) pcnt[i][j] = 0;
        scanf("%s", s + 1);
        for (int i = 1; i <= n; ++i) {
            for (int j = 0; j < 26; ++j) pcnt[i][j] = pcnt[i - 1][j];
            ++pcnt[i][s[i] - 'A'];
        }
        while (q--) {
            int l, r;
            scanf("%d%d", &l, &r);
            for (int i = 0; i < 26; ++i) {
                int val = pcnt[r][i] - pcnt[l - 1][i];
                if (val > 0) {
                    printf("%d\n", val);
                    break;
                }
            }
        }
    }
    return 0;
}