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

int JudgeC(char c)
{
	if((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'))
		return 1;
	else if(c == ' ') return 0;
	else if(c == '\n') return -1;
}

int main()
{
	char c;
	int Zimu = 0,Word = 0,a[26] = {0},flag = 0,count = 0;
	while(c = getchar())
	{
		if(JudgeC(c) == 1)
			Zimu++,flag = 1,count++;
		else if(JudgeC(c) == 0)
			flag = 0;
		else if(JudgeC(c) == -1) 
			if(flag == 1 || count != 0)
			{
				Word++;
				break;
			}
		if(!flag && count != 0) Word++,count = 0;
		if(flag)
			if(c >= 'a' && c<= 'z')
				a[c-'a'-0]++;
			else a[c-'A'-0]++;
	}
	int max = 0,i;
	for(i = 1; i < 26; i++)
		if(a[max] < a[i])
			max = i;
	printf("%d\n%d\n",Zimu,Word);
	for(i = 0; i < 26; i++)
		if(a[max] == a[i])
			printf("%c ",'a'+i);
	printf("\n%d\n",a[max]);
	
	return 0;
}