【題解】AtCoder ABC 171A – αlphabet

【題目敘述】https://atcoder.jp/contests/abc171/tasks/abc171_a

#include <iostream>
using namespace std;

char c;

int main() {
    cin >> c;
    if ('A' <= c && c <= 'Z') cout << "A\n";
    else cout << "a\n";
}
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