#include<stdio.h>

int main()
{
    int i, num, arr[10]={0,0,0,0,0,0,0,0,0,0};
    scanf("%d",&num);
    while(num!=0)
    {
        int reminder = num % 10;
        num = num / 10;
        arr[reminder]=1;
    }
    for(i=0; i<10; i++)
    {
        if(arr[i]==0)
        {
            printf("%d ",i);
        }
    }

}