题解 | #牛牛的字符矩形#

#include <stdio.h>

int main() 
{char a;
scanf("%c",&a);
printf("%c%c%c\n",a,a,a);
printf("%c%c%c\n",a,a,a);
printf("%c%c%c\n",a,a,a);


    
}

The most easy way,but it seems a little silly for you.