#include <stdio.h>
int main() {
    int num1, num2;
    int digits[10] = {0};
    int digits2[10] = {0};
    int i;
    int hasCommon = 0;
    scanf("%d %d", &num1, &num2);
    if (num1 < 0 || num1 > 10000 || num2 < 0 || num2 > 10000) {
        printf("Invalid input\n");
        return 0;
    }
    if(num1 == 0) digits1[0] = 1;
    while (num1 > 0) {
        digits1[num1 % 10] = 1;
        num1 /= 10;
    }
    
    if (num2 == 0) digits2[0] = 1;
    while (num2 > 0) {
        digits2[num2 % 10] = 1;
        num2 /= 10;
    }
    for (i = 0; i <= 0; i++) {
        if (digits1[i] && digits2[i]) {
            if(hasCommon) {
                printf(" ");
            }
            printf("%d", i);
            hasCommon = 1;
        }
    }
    if (!hasCommon) {
        printf("No common elements");
    }
    printf("\n");
    return 0;
}