n = int(input())
board = [input() for _ in range(n)]

all_s = [i for i in range(n) if 'F' not in board[i]]
all_f = [i for i in range(n) if 'S' not in board[i]]

NEED = n // 4

avail = []
if len(all_s) >= NEED:
    avail.append((all_s, 'S', 'F'))
if len(all_f) >= NEED:
    avail.append((all_f, 'F', 'S'))

chosen, special, other = max(avail, key=lambda x: -len(x[0]))
chosen.sort(key=lambda i: -board[i].count(special))

assert len(chosen) >= NEED
chosen = chosen[:NEED]

for i, row in enumerate(board):
    for j, cell in enumerate(row):
        if i == j:
            print('.', end='')
        elif i in chosen or j in chosen:
            assert cell in (special, '?')
            print(special, end='')
        elif cell == '?':
            print(other, end='')
        else:
            print(cell, end='')
    print()