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


char c[5];

int is_equal () {
	return !(c[0] == c[1] || c[0] == c[2] || c[0] == c[3] || c[1] == c[2] || c[1] == c[3] || c[2] == c[3]);
}

int main () {
	int k = 0;
	int j = 1;
	char f;
	c[5] = 0;
	while (j < 5) {
		c[k] = getchar();
		k++;
		j++;
	}

	while ((f = getchar()) != EOF) {
		k %=4;
		printf("%d %s f:%c\n",k,c,f);
		if (is_equal()) break;
		c[k] = f;
		k++;
		j++;
	}
	printf("%d\n", j-1);
	
}