#include <stdio.h>

using namespace std;

long long L = 0;
int l = 0, start = 0, nrcuv = 0;
char ch;
int main(){
	freopen("text.in", "r", stdin);
	freopen("text.out", "w", stdout);
	scanf("%c", &ch);
	if(ch >= 65 && ch <= 97){		
		l = start =1;
	}
	while(ch != '\n'){
		scanf("%c", &ch);
		if(ch >= 65 && ch <= 129){		
			if( start != 1 ){
				start = 1; l = 1;
			}else{
				l++;
			}
		}else{
			if( start == 1 ){
				start = 0;  L += l;
				l = 0; nrcuv++;
			}
		}
	}
	L = (long long)(L / nrcuv);
	printf( "%lld", L);
}
//- Lasa-ma in pace, ca am invatat azi noapte toata ziua!