// https://www.luogu.com.cn/record/38657002 #include <bits/stdc++.h> using namespace std; string cnm() { int n; char ch; string s = ""; string str = ""; while (cin >> ch) { if (ch == '[') { cin >> n; str = cnm(); while (n--) { s += str; } } else if (ch == ']') { return s; } else { s += ch; } } return s; } int main() { cout << cnm() << endl; return 0; }