#include<stdio.h>
FILE *fin=fopen("text.in","r");
FILE *fout=fopen("text.out","w");
char x;
int k,i,q;
int main(){
	k=0; q=1;
	while(!feof(fin)){
		fscanf(fin,"%c",&x);
		if((65<=x && x<=90)||(65<=x && x<=122)) k++;
		if(x==' ' || x=='\n') q++;
	}
	fprintf(fout,"%d",k/q);
	/*for(i=1;i<=255;i++)
		fprintf(fout,"%d %c\n",i,(char)i);*/
	fclose(fin);
	fclose(fout);
	return 0;
}