#include<stdio.h>

void Sj(char a, int &x){
	if(a == 'a'|| a == 'd'|| a == 'g'|| a == 'j'|| a == 'm'|| a == 'p'|| a == 't'|| a == 'w'|| a == ' ') x += 1;
	else if(a == 'b'|| a == 'e'|| a == 'h'|| a == 'k'|| a == 'n'|| a == 'q'|| a == 'u'|| a == 'x') x += 2;
	else if(a == 'c'|| a == 'f'|| a == 'i'|| a == 'l'|| a == 'o'|| a == 'r'|| a == 'v'|| a == 'y') x += 3;
	else x += 4;
}

int main(){
	int n = 0;
	char s = 'a';
	s = getchar();
	while(s != '\n'){
		Sj(s, n);
		s = getchar();
	}
	printf("%d\n",n);
	return 0;
}