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

int main(void) {
	int freq, creature[1000], eyes[1001] = { 0 };
	int i, j, blind = 0, mode;

	scanf("%d", &freq);

	for (i = 0; i < freq; i++) {
		scanf("%s", &creature);
		eyes[strlen(creature) - 2]++;
	}

	for (j = 0; j < 1001; j++) {
		if (blind <= eyes[j]) {
			blind = eyes[j];
			mode = j;
		}
	}

	printf("%d\n", mode);

	return 0;
}