#include<stdio.h>
#include<string.h>
int main () {
	char n;
	int nr=0,nr2=0,k=0;
	FILE *in=fopen("text.in","r"), *out=fopen("text.out","w");
	while(fscanf(in,"%c",&n)!=EOF){
		if((n>='A'&&n<='Z')||(n>='a'&&n<='z')){
			nr2++;
			if(k==0)
				nr++;
			k=1;
		}
		else
			k=0;
	}
	fprintf(out,"%d\n",nr2/nr);
	return 0;
}