#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n=0;
    int hold;
    int count0 =0, count1 =0, count2 =0, count3 =0, count4 =0, count5 =0, count6 =0, count7 =0, count8 =0, count9 =0;

    while(n == 0){
        printf("n=");
        scanf("%d", &n);
    }

    while(n != 0){
        hold = n%10;
        n /=10;
        switch(hold){
        case 0:
            count0++;
            break;
        case 1:
            count1++;
            break;
        case 2:
            count2++;
            break;
        case 3:
            count3++;
            break;
        case 4:
            count4++;
            break;
        case 5:
            count5++;
            break;
        case 6:
            count6++;
            break;
        case 7:
            count7++;
            break;
        case 8:
            count8++;
            break;
        case 9:
            count9++;
            break;
        }
    }

    if(count0 % 2 == 0 && count0 != 0){
        printf("0 ");
    }
    if(count1 % 2 == 0 && count1 != 0){
        printf("1 ");
    }
    if(count2 % 2 == 0 && count2 != 0){
        printf("2 ");
    }
    if(count3 % 2 == 0 && count3 != 0){
        printf("3 ");
    }
    if(count4 % 2 == 0 && count4 != 0){
        printf("4 ");
    }
    if(count5 % 2 == 0 && count5 != 0){
        printf("5 ");
    }
    if(count6 % 2 == 0 && count6 != 0){
        printf("6 ");
    }
    if(count7 % 2 == 0 && count7 != 0){
        printf("7 ");
    }
    if(count8 % 2 == 0 && count8 != 0){
        printf("8 ");
    }
    if(count9 % 2 == 0 && count9 != 0){
        printf("9 ");
    }

    return 0;
}