Monistus

#include <bits/stdc++.h>

using namespace std;
 
void init_code() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
#ifndef ONLINE_JUDGE
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
}

const int inf = 1e9;
void solve() {
    string s;
    cin >> s;

    vector<char> res;
    deque<char> dq;

    int n = s.size();
    for (int i = 0; i < n; ++i) {
        dq.push_back(s[i]);
    }

    while(!dq.empty()) {
        char c = dq.front();
        dq.pop_front();
        
        //cout << c << '\n';

        if (isalpha(c)) {
            res.push_back(c);
            continue;
        }

        int d = (c - '0');
        vector<char> tmp;
        for (int i = 0; i < d; ++i) {
            tmp.push_back(dq[i]);
        }

        for (int i = d - 1; i >= 0; --i) {
            dq.push_front(tmp[i]);
        }
    }

    //cout << '\n';

    for (auto i : res) {
        cout << i;
    }
}
 
signed main() {
  init_code();
  int t = 1;
  // cin >> t;
  while (t--) {
    solve();
  }
  return 0;
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 1, 2

Verdict: ACCEPTED

Test 7

Group: 1, 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED