#include <iostream> #include <string> #include <cstdio> bool hui(std::string str) { for (int i = 0, j = str.length() - 1; i < j; i++, j--) { if (str[i] != str[j]) { return false; } } return true; } int main() { std::ios::sync_with_stdio(0); std::cin.tie(0); std::cout.tie(0); std::string time; std::cin >> time; int nian = stoi(time.substr(0, 4)); int yue = stoi(time.substr(4, 2)); int ri = stoi(time.substr(6, 2)); int flag = 0; for (int year = nian; flag < 3; year++) for (int month = 1; month <= 12; month++) for (int day = 1; day <= 31; day++) { if (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12); else if (month == 2) { if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) { if (day > 29) break; } else { if (day > 28) break; } } else { if (day > 30) break; } if (nian == year && yue == month && ri == day) { flag=1; } if (flag) { std::string str; str += std::to_string(year); if (month < 10) { str += '0'; str += std::to_string(month); } else { str += std::to_string(month); } if (day < 10) { str += '0'; str += std::to_string(day); } else { str += std::to_string(day); } if (hui(str) && flag > 1) { std::printf("%d%02d%02d", year, month, day);