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#include <iostream> #include <string> #include <cmath> using namespace std; int main() { char i; cin >> i; if (isdigit(i)) cout << "yes"; else cout << "no"; }
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#include <iostream> #include <string> #include <cmath> using namespace std; int main() { char i; cin >> i; if (isdigit(i)) cout << "yes"; else cout << "no"; }