def isOver(a,b):
    return True if (a[0]-b[0])**2 + (a[1]-b[1])**2 <= 4.0 else False
 
def largestGroup(mtrx,num):
    mx = 1
    ls = [num]
    for i in mtrx[num]:
        if i == num:
            continue
        m = youKnow(mtrx,ls,i)
        mx = max(mx,m)
    return mx
 
def youKnow(mtrx,ls,num):
    mx = len(ls)
    if set(ls) <= set(mtrx[num]):
        if num not in ls:
            ls.append(num)
        for i in list(set(mtrx[num])-set(ls)):
            m = youKnow(mtrx,ls,i)
            mx = max(mx,m)
    return mx
 
while True:
    max_over = 0
    n = int(raw_input())
    if n == 0: break
    seals = [map(float, raw_input().split(",")) for i in range(n)]
    print "OK"
    overs = []
    for i in range(n):
        over = []
        for j in range(n):
            if isOver(seals[i],seals[j]):
                over.append(j)
        overs.append(over)
         
    ref = [i for i in range(n)]
    for i in ref:
        num_over = largestGroup(overs,i)
        for j in overs[i]:
            ref.remove(j)
        if num_over > max_over:
            max_over = num_over
    print max_over