题解 | 吐泡泡

n = int(input())
for _ in range(n):
    li, a = list(input().strip()), []
    for i in li:
        if i == "o":
            if a and a[-1] == "o":
                a.pop()
                a.pop() if a and a[-1] == "O" else a.append("O")
            else:
                a.append(i)
        elif i == "O":
            a.pop() if a and a[-1] == "O" else a.append(i)
        else:
            a.append(i)
    print("".join(a))