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代码：

#include <cstdio>
int main()
{
    int a, b, f;
    char c, t;
    scanf("%d%d", &a, &b);
    getchar();
    scanf("%c%d", &c, &f);
    for (int i = 0; i < b; i++) printf("%c", c);
    printf("\n");
    t = f ? c : ' ';
    for (int i = 0; i < a - 2; i++)
    {
        printf("%c", c);
        for (int j = 0; j < b - 2; j++)
            printf("%c", t);
        printf("%c\n", c);
    }
    for (int i = 0; i < b; i++) printf("%c", c);
    return 0;
}