N = int(raw_input())
s = [list(raw_input()) for _ in range(N)]

for j in range(N):
    if s[0][j] == "-": s[0][j],s[j][0] = "o","x"
w = [s[i].count("o") for i in range(N)]
for i in range(N):
    for j in range(i+1,N):
        if s[i][j] == "-":
            if   w[i] > w[0]: w[i] += 1
            elif w[j] > w[0]: w[j] += 1
            elif w[i] >= w[j]: w[j] += 1
            else: w[i] += 1

print sorted(i for i in w)[::-1].index(w[0])+1