#include <stdio.h>
#include <stdlib.h>
int kakunin(char *b){
 
	char a[]={'b','c','d','f','g','h','k','l','m','n','p','q','r','s','t','v','w','x','y','z'};
 
	int i,j;
	int count=0;
	for(i=0;b[i]!='\0';i++){
		for(j=0;j<20;j++){
			if(a[j]==b[i]){
		count++;
		break;
			break;
			}else{
				;
			}
		}
	}printf("%d",count);
 
 
}
int main(void) {
	char *b;
	b = (char *)malloc(sizeof(char) * 32);
	int c,d;
 scanf("%31s",b);
	kakunin(b);
	free(b);
	return 0;
}

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