//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//  MMMMMMMMMMMMMMMMNOtXtdMMMMMNxzZMMNmgHyVVVVVW%..?/(.,(x-..........(HfffpffpffpffWHHffpffppfVyyWMMMMMM


//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

const string AGCT = "AGCT";

int main() {

    int N, Q;
    cin >> N >> Q;

    string S;
    cin >> S;

    vector<int> a(N, 0);
    for (int i = 1; i < N; i++) if (S[i] == 'C' && S[i - 1] == 'A') a[i]++;

    vector<int> b(N + 1, 0);
    for (int i = 0; i < N; i++) b[i + 1] = b[i] + a[i];

    while (Q--) {
        int l, r;
        cin >> l >> r;
        l--, r--;
        int d = b[r + 1] - b[l];
        if (l > 0 && S[l] == 'C' && S[l - 1] == 'A') d--;
        cout << d << endl;
    }

    return 0;
}










































Measured memory_bytes: 1792