#include <stdio.h>
#include <string.h>

int main(void)
{
    char E[62];
    char D[62];
    int i, j, max;
    int find = 1;

    while (find) {
        scanf("%s", E);
        max = strlen(E);
        if (E[0] == 0) {
            find = 0;
        }
        if (find) {
            for (i = 1; i <= max ; i++) {
                E[i] = E[i] - ' ';
            }
        }
        for (i = 0, j = 0; i <= max, j <= max ; i = i + 4, j = j + 3) {
            D[j] = (E[i] << 2) + (E[i + 1] >> 4);
            D[j + 1] = (E[i + 1] << 4) + (E[i + 2] >> 2);
            D[j + 2] = (E[i + 2] << 6) + (E[i + 3] >> 2);
        }
        for (j = 0; j <= max; j++) {
            printf("%c", D[j]);
        }
    }
    return 0;
}