#include <iostream> #include <string> using namespace std; int main() { string str; cin >> str; if (str.empty()) { cout << "" << endl; return 0; } string res; char current = str[0]; int count = 1; for (int i = 1; i < str.size(); i++) { if (str[i] == current) { count++; } else { res += to_string(count); res += current; current = str[i]; count = 1; } } res += to_string(count); res += current; cout << res << endl; return 0; }