#include<string>
using namespace std;
int main(void)
{
	string s;
	getline (cin, s);
	int cnt=0;
	for(int i=0; i<s.length(); i++)
	{
		if(s[i]>='0'&&s[i]<='9')cnt++;
	}
	cout<<cnt;
	return 0;
}

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