#include<stdio.h>
#include<string.h>
#include<ctype.h>
#define NMAX 2100000

char c;
int Nr, L, i;
bool cuv;

int main()
{
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);

	while( !feof(stdin) )
	{
		scanf("%c", &c);
		if( isalpha( c ) ) { ++L; cuv = true; }
		else if( cuv ) { ++Nr; cuv = false; }
	}

	printf("%d\n", L/Nr );

	return 0;
}