#include<stdio.h>
int main()
{
	FILE*f=fopen("text.in","r");
	char c;
	int nrc=0,nrl=0,cuv=0;
	while(!feof(f))
	{
		fscanf(f,"%c",&c);
		if(c>=65&&c<=90||c>=97&&c<=122)
		{
			++nrl;
			if(!cuv){cuv=1;++nrc;}
		}
		else cuv=0;
	}
	fclose(f);
	FILE*g=fopen("text.out","w");
	fprintf(g,"%d",nrl/nrc);
	fclose(g);
	return 0;
}