N = int(input())
S = [[c for c in input()] for i in range(N)]
for i in range(1, N):
    if S[0][i] == '-':
        S[0][i] = 'o'
        S[i][0] = 'x'

win = [0 for i in range(N)]
for i in range(N):
    for j in range(N):
        if S[i][j] == 'o':
            win[i] += 1
print(sorted(list(set(win))).index(win[0]))