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#include <bits/stdc++.h>
using namespace std;
int main() {
string a;
//注意，这里是有空格的语句，不能直接使用cin!!!
getline(cin, a);
int count = 0;
for (int i = 0; i < a.length(); i++) {
if (a[i] >= '0' && a[i] <= '9') {
count++;
}
cout << count << endl;
return 0;
