#include <stdio.h>

FILE*f = fopen("text.in","r");
FILE*g = fopen("text.out","w");

char x;
int nr,s,j,i,cuv;

int main(){
	
	while(fscanf(f,"%c",&x)!=EOF) {
		
		if(x<'A' || x>'z'){
			if(cuv==1){
				nr++;
				cuv=0;
			}
		}
		
		if(x>='A' && x<='z'){
			if(cuv==1){
				s++;
			} else {
				if(cuv==0){
					cuv=1;
					s++;
				}
			}
		}
		
	}
	
	x=EOF;
//	if(x<'A' || x>'z'){
		if(cuv==1){
			nr++;
			cuv=0;
		}
//	}
		
	/*if(x>='A' && x<='z'){
		if(cuv==1){
			s++;
		} else
		if(cuv==0){
			cuv=1;
			s++;
		}
	}*/
	
	
	fprintf(g,"%d",s/nr);
	
	fclose(f);
	fclose(g);
	return 0;
}