#include<stdio.h>
int main(){
	FILE*in=fopen("text.in","r");
	FILE*out=fopen("text.out","w");
	int lit=0,cuv=0,k=0;
	char a;
	fscanf(in,"%c",&a);
	while(fscanf(in,"%c",&a)!=EOF){
		if(((a>='a')&&('z'>=a))||((a>='A')&&('Z'>=a))||((a>='0')&&('9'>=a))){
			lit++;
			if(k==0)
				cuv++;
			k=1;
			if((a>='0')&&('9'>=a))
				cuv++;
		}
		else
			k=0;
	}
	
	fprintf(out,"%d\n",lit/cuv);
	return 0;
}