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from fractions import *
line = input()
line = line.split()
n = int(line[0])
m = int(line[1])

board = []
for i in range(n):
    row = '.'
    line = input()
    row += line
    row += '.'
    board.append(row)

if n == 1:
    prefq = []
    prefd = []
    cntq = 0
    cntd = 0
    for c in board[0]:
        if c == '?':
            cntq += 1
        if c == '.':
            cntd += 1
        prefq.append(cntq)
        prefd.append(cntd)

    res = Fraction()
    for i in range(m+1):
        for j in range(i+1, m+1):
            if j-i == 2:
                continue
            if board[0][i] == 'O' or board[0][j+1] == 'O':
                continue
            if prefd[j] > prefd[i]:
                continue
            tmp = Fraction(1, 2 ** (prefq[j]-prefq[i]))
            if board[0][i] == '?':
                tmp *= Fraction(1, 2)
            if board[0][j+1] == '?':
                tmp *= Fraction(1, 2)
            res += tmp
            #print(i, j, tmp)

    print(str(res.numerator) + '/' + str(res.denominator))