n = gets.chomp.to_i
ans = [0] * n
while i = gets
  s = i.chomp.split.index("nyanpass") 
  s == nil ? s = n : s = s
  ans.include?(s) ? ans[s] += 1 : ans[s] = 1
end
p ans.index(ans.max) == n ? -1 : ans.index(ans.max)