include

include

using namespace std; int main() {

char s[10];
gets(s);
int n=strlen(s);
int ans=0;
for(int i=0;i<n;i++)
{
	if(s[i]>='A'&&s[i]<='Z')
	ans++;
	if(s[i]>='a'&&s[i]<='z')
	ans++;
	if(s[i]>='0'&&s[i]<='9')
	ans++;
}
printf("%d",ans);
return 0;

}