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

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

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

	gets(S);
	p = S;
	while( *p )
	{
		for( ; !isalpha( *p ) && *p ; ++p );
		if( !*p ) break;

		++Nr;
		for( ; isalpha( *p ); ++p, ++L );
	}

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

	return 0;
}