#include<stdio.h>
int main(){
	int count, number;
	count = 0;
	scanf("%d", &number);
	if(number < 0){
		number  = -number;
	}
	do{
		number = number / 10;
		count++;
	}while(number != 0);
	printf("%d\n", count);
	return 0;
}