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

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

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

	gets(S);
	i = 0;
	while( i < strlen(S) )
	{
		while( !isalpha( S[i] ) && i < strlen(S) ) i++;
		if( i == strlen(S) ) break;

		++Nr;
		while( isalpha( S[i] ) && i < strlen(S) ) i++, L++;
	}

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

	return 0;
}