char ch;
    cin >> ch;

    int height = 3;  // 高度
    for (int i = 1; i <= height; i++) {
        // 打印空格
        for (int j = 0; j < height - i; j++) cout << ' ';
        // 打印字符
        for (int j = 0; j < 2*i - 1; j++) cout << ch;
        cout << endl;
    }