БӨЛЧӨК

#include <bits/stdc++.h>

using namespace std;

int main(){
    ios::sync_with_stdio(0);

    string a, b, s;
    cin >> s;

    a = s.substr(0, s.find('/'));
    b = s.substr(s.find('/') + 1, s.size());

//    cout << a << " / " << b << endl;

    sort(a.begin(), a.end());
    sort(b.begin(), b.end());

    map <char, int> cnta, cntb;

    for (char c : a) cnta[c]++;
    for (char c : b) cntb[c]++;

    string numerator, denominator;

    for (int c = 'A'; c <= 'Z'; c++) {
        int A = cnta[c];
        int B = cntb[c];
        if (A > B) {
            numerator += char(c);
            if (A - B != 1)
                numerator += to_string(A - B);
        }
        if (B > A) {
            denominator += char(c);
            if (B - A != 1)
                denominator += to_string(B - A);
        }
    }

    if (numerator.empty()) {
        cout << 1 << "/";
        if (denominator.empty()) {
            cout << 1;
        } else {
            cout << denominator;
        }
    } else {
        cout << numerator << "/";
        if (denominator.empty()) {
            cout << 1 << endl;
        } else {
            cout << denominator << endl;
        }
    }
}