#include<fstream> 
#include<stdio.h> 
using namespace std;
int main() 
{     
	char c='a',d;    
	int x=0,nr=0;
	FILE *f=fopen("text.in","r");   
	//ifstream fcin("text.in");
	ofstream fcout("text.out"); 
	while(c!='\n')
	{
		fscanf(f,"%c",&c);
		if((c>='a'&&c<='z') || (c>='A' && c<='Z'))nr++;
		else if(nr!=0 && (d>='a'&&d<='z') || (d>='A' && d<='Z'))x++;
		d=c;
	}    
	fcout<<nr/x;     
	return 0; 
}