50求调

#include<bits/stdc++.h>
using namespace std;
int main(){
    string a;
    cin>>a;
    int b=a.size();
    int c=0;
    for(int i=0;i<b;i++){
        if(a[i]=='1'||a[i]=='2'||a[i]=='3'||a[i]=='4'||a[i]=='5'||a[i]=='6'||a[i]=='7'||a[i]=='8'||a[i]=='9'||a[i]=='0')
            c++;
    }
    cout<<c;
    return 0;
}