题解如下

#include<bits/stdc++.h>
using namespace std;
string s;
int cnt = 0;
int main(){
	getline(cin,s);
	int len = s.size();
	for(int i=0;i<=len-1;i++){
		if(s[i]>='0' and s[i]<='9') cnt++;
	}
	cout<<cnt;
	return 0;
}