import sequtils, strutils

var
    n = readLine(stdin).parseInt
    a = newSeqWith(n, newSeq[string](n))
    posRen:seq[int] = @[]

for i in 0..<n:
    a[i] = (readLine(stdin).split)

for j in 0..<n:
    block loop:
        for k in a[0..<n][j]:
            if not(k.in(["nyanpass", "-"])):
                break loop
        posRen.add(j)
if posRen.len == 0 or posRen.len >= 2:
    echo -1
else:
    echo posRen[0] + 1