/*  Example: Average line length
	Author: Peter Brusilovsky
 */

#include <stdio.h>

void main () {
	int c, nl;
	long nc;

	nl = 0; nc = 0;
	while((c = getchar()) != EOF) {
		if(c == '\n')
			++nl;
		++nc;
	}
	if(nl)
		printf("Average line length is %.2f\n", nc / (float) nl);	
}