#include <stdio.h>
#include <stdbool.h>

int main()
{
    char c, cc, b = NULL, e;
    int k = 0, d;
    while (1) {
        c = getchar();
        if (c == EOF) return 0;
        k = 0;
        while (c != ' ' || c != '\n') {
            if (isdigit(c) == true && k != 0) b = c;
            else {
                while (cc != ' ' || cc != '\n') {
                    cc = getchar();
                }
                break;
            }
            printf("||");
            c = getchar();
            if (isdigit(c) == true) {
                if (b != NULL) putchar(b);
            }
            k = 1;
        }
    }
}