Falling footballs

T = int(input())
for t in range(1, T + 1):

    print(f"Case {t}:")
    n = int(input())
    l = list(map(int, input().split()))
    mapy = {}

    for pos in l:
        mapy[pos] = 1 + (0 if pos not in mapy else mapy[pos])
        i = pos
        while (0 if i + 1 not in mapy else mapy[i + 1]) < mapy[i] - 1:
            mapy[i + 1] = 1 + (0 if i + 1 not in mapy else mapy[i + 1])
            mapy[i] -= 1
            i += 1

        i = pos
        while (0 if i - 1 not in mapy else mapy[i - 1]) < mapy[i] - 1:
            mapy[i - 1] = 1 + (0 if i - 1 not in mapy else mapy[i - 1])
            mapy[i] -= 1
            i -= 1

    keys = list(mapy.keys())
    rangee = (min(keys), max(keys))

    width = rangee[1] - rangee[0] + 1
    vals = [0] * width

    for key in range(rangee[0], rangee[1] + 1):
        vals[key - rangee[0]] = 0 if key not in mapy else mapy[key]

    height = max(vals)

    m = height
    n = width


    mat = [['.' for _ in range(n)] for _ in range(m)]
    for i in range(m):
        for j in range(n):
            if vals[j] > 0:
                mat[i][j] = 'O'
            vals[j] -= 1
    for i in range(m - 1, -1, -1):
        print(''.join(mat[i]))