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

int main(){
	int	N, i, j;
	char	vstup[2000][8];
	int	pism[7][26];
	int	maxriadok, max;
	int	s, Q;

	while(1){
		scanf("%d", &N);
		if (N == 0) break;
		
		memset(vstup, 0, N*8*sizeof(char));
		memset(pism, 0, 7*26*sizeof(int));
		
		for (i = 0; i < N; i++){
			scanf("%s", vstup[i]);
			for (j = 0; j < 7; j++)
				pism[j][vstup[i][j]-'a'] ++;
		}
		
		max = 0;
		for (i = 0; i < N; i++){
			s = 0;
			for (j = 0; j < 7; j++)
				s += pism[j][vstup[i][j]-'a'];
			if (s > max){
				max = s;
				maxriadok = i;
			}
		}
		Q = 0;
		for (j = 0; j < 7; j++)
			Q += N - pism[j][vstup[maxriadok][j]-'a'];
		printf("The highest possible quality is 1/%d.\n", Q);
	
	}

	return 0;
}