24 lines
270 B
C++
24 lines
270 B
C++
#include <bits/stdc++.h>
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#define endl '\n'
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using namespace std;
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int n;
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int arr[100100];
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int main(){
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char c;
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cin >> c;
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// 判断c是大写还是小写
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if(c >= 'a' && c <= 'z'){
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// 小写
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c = c - 'a' + 'A';
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} else {
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c = c - 'A' + 'a';
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}
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cout << c;
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return 0;
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}
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