#include<bits/stdc++.h>
using namespace std;
int unique(long long int number)
{
    char seen[10] = {0};
 
    while (number) {
        int digit = number % 10;
 
        number /= 10;
        if (digit < 0) {
            /* 
             * The number was negative.  Make it positive.
             * (Note: Checking the number is negative before the while
             * loop could fail when number is LLONG_MIN, so do it here
             * instead.)
             */
            digit = -digit;
            number = -number;
        }
        if (seen[digit]++)
            return 0; /* not unique */
     }
     return 1; /* unique */
 }
int main(){
	cout<<unique(2021);
 
}

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