题解 | 吐泡泡

n = int(input())
for i in range(n):
    stack = []
    pp = input()
    for p in pp :
        if stack == []:
            stack.append(p)
        elif p == 'o' and stack[-1] == 'o':
            stack.pop()
            if stack ==[]:
                stack.append('O')
            elif stack[-1] == 'O':
                stack.pop()
            else:
                stack.append('O')
        elif p =='o':
            stack.append(p)
        elif p == 'O' and stack[-1] == 'O':
            stack.pop()
        else:
            stack.append('O')
    print(''.join(stack))