int outPutBuf[82][82]; //用于预排版的输出缓存

char a , b, c; //输入的两个字符

int n; //叠框大小

bool firstCase = true; //是否为第一组数据标志，初始值为true

while (scanf ("%d %c %c",&n,&a,&b) == 3){

if (firstCase == true){ //若是第一组数据

firstCase = false; //将第一组数据标志标记成false

}

else printf("\n"); //否则输出换行

for (int i = 1,j = 1; i <= n; i += 2,j ++){ //从里至外输出每个圈

//获取中心坐标

int x = n / 2 + 1;

int y = x;

//获取每个圈右上角点的坐标

x =x - j + 1;

y =y - j + 1;

//获取当前圈使用字符

if(j%2 == 1){

c = a;

}

else c = b;

//对当前圈进行赋值,排版

for (int k = 1; k <= i; k ++) {

outPutBuf[x + k - 1][y] = c; //左边赋值

outPutBuf[x][y + k - 1] = c; //上边赋值

outPutBuf[x + i - 1][y + k - 1] = c; //右边赋值

outPutBuf[x + k - 1][y + i - 1] = c; //下边赋值

}

}

if (n != 1){ //注意当n为1时不需此步骤

outPutBuf[1][1] = ' ';

outPutBuf[n][1] = ' ';

outPutBuf[1][n] = ' ';

outPutBuf[n][n] = ' '; //将四角置为空格

}

//output

for (i = 1; i <= n; i ++){

for (int j = 1; j <= n; j ++){

printf("%c",outPutBuf[i][j]);

}

printf("\n");

}

}

return 0;