#include<stdio.h>
#include<string.h>
#include<ctype.h>
#define NMAX 1100000

char S[NMAX];
int Nr, L, i;

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

	gets(S);
	for( i=0; i < strlen(S); i++ )
	{
		if( isalpha( S[i] ) ) ++L;
		if( isalpha( S[i] ) && !isalpha( S[i+1] ) ) ++Nr;
	}

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

	return 0;
}