#include <iostream>
#include <string>
 
using namespace std;
 
int main() {
    int i, f;
    string t;
    cin >> i >> f;
    cin.ignore(); // Ignorar el salto de línea
 
    getline(cin, t);
    if (i < 0 || f < 0 || i >= t.size() || f >= t.size()) {
        cerr << endl;
        return 1;
    }
 
    int c[26] = {};
    for (int j = i; j <= f && j < t.size(); j++) {
        char l = tolower(t[j]);
        if (l >= 'a' && l <= 'z') {
            c[l - 'a']++;
        }
    }
    for (char l = 'a'; l <= 'z'; l++) {
        cout << l << ": " << c[l - 'a'] << endl;
    }
 
    return 0;
}

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MCAzCmhvbGEgY2hpY29z

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hola chicos