#include <stdio.h>
int main()
{
char ch;
while((ch=getchar()) != '\n'){
if(ch>='A'&& ch<='Z'){
ch+=32;
putchar(ch);
}
else if(ch>='a' && ch<='z'){
ch-=32;
putchar(ch);
}
}
return 0;
}
//示例运行结果:
F:\c_work>a.exe
abcdEFGHIjklmn
ABCDefghiJKLMN
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