char p[1000010];
a[140000];
m,s;

ad(char i){
	int x;
	if(i<11)return 0;
	++s;
	a[0]=a[0]*10+i-48;
	for(x=1;x<=s>>3;x++){
		a[x]*=10;
		a[x]+=a[x-1]>>25;
		a[x-1]&=0x1FFFFFF;
	}
	return 1;
}

main(){
	for(;ad(getchar()););
	for(s=s/8+1;s--;)m+=__builtin_popcount(a[s]);
	printf("%d",m);
	return 0;
}