#include<stdio.h>

int main()
{
    int n, i , oddFound = 0;
    int arr[10];
    scanf("%d", &n);
    
    for (i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
        if (arr[i] %2 !=0)
        oddFound = 1;
    }
    
    if (!oddFound) {
        printf("Invalid input");
        } else {
            for (i = 0 ;i<n;i++){
                if (arr[i] %2 !=0)
                printf("%d", arr[i]);
        }
        return 0;
}