It seems like the year of 2013 came only yesterday. Do you know a curious fact? The year of 2013 is the first year after the old 1987 with only distinct digits.

Now you are suggested to solve the following problem: given a year number, find the minimum year number which is strictly larger than the given one and has only distinct digits.
The single line contains integer *y* (1000 ≤ *y* ≤ 9000) — the year number.
#include <iostream>
#include <string>
#include <unordered_set>

int main() {
    int y;
    std::cin >> y;

    while (true) {
        y++;
        std::string year_str = std::to_string(y);
        std::unordered_set<char> digits(year_str.begin(), year_str.end());
        if (digits.size() == 4) {
            std::cout << "The minimum year number with distinct digits larger than " << y << " is: " << y << std::endl;
            break;
        }
    }

    return 0;
}
 						   		  	   	 	 	 	 		 	