if (#1 == AC && #2 == AC && #3 == WA && #4 == WA && #5 == WA && #6 == WA)
    Use {
        string str, st;
        while (cin >> s)
            str += s;
    } to compplete the second part of your input.

---

装逼结束，正片开始：

如果 $You$ ${\color{red}Wa}\ on$ #3#4#5#6
记得题目里面是多行输入，用 $while$ 循环读到 ${\color{red}E}{\color{ffff00}nd}{\color{green}O}{\color{00ffff}f}{\color{blue}F}{\color{ff00ff}ile}$ 结束。代码不予展示，留作读者思考 \









































$\\$

终究还是心软了^_^
str = '$';
while (cin >> s) str += s;

$\\$