Beautiful Year.c

// Hazart Ali
// University Of Scholars
#include <stdio.h>
int main()
{
    int n;
    scanf("%d", &n);
    n++;
    int a = n / 1000, b = (n / 100) % 10, c = (n / 10) % 10, d = n % 10;
    while (a == b || a == c || a == d || b == c || b == d || c == d)
    {
        n++;
        a = n / 1000;
        b = (n / 100) % 10;
        c = (n / 10) % 10;
        d = n % 10;
    }
    printf("%d%d%d%d", a, b, c, d);
    return 0;
}