#include <cstdio>

int main(){
	
	freopen("text.in","r",stdin);
	freopen("text.out","w",stdout);
	
	char x;
	
	int nrcuvinte=0, littotal=0; 
	bool incep=0;
	
	
	for(; scanf("%c",&x)!=-1; ){
		if( (x>='a' && x<='z') || (x>='A' && x<='Z') ){
			++littotal;
			incep=1;
		}
		else if(incep){
				++nrcuvinte;
				incep=0;
		}

	}
	
	printf("%d", littotal/nrcuvinte);
}