[백준] 3009 네번째점 스위프트

var x:[Int] = []
var y:[Int] = []
for _ in 1...3{
let input = readLine()!.split(separator: " ").map{Int($0)!}
    x.append(input[0])
    y.append(input[1])
}
var xresult = 0
var yresult = 0
if x[0] == x[1] {
    xresult = x[2]
}else if x[0] == x[2]{
    xresult = x[1]
}else{
    xresult = x[0]
}

if y[0] == y[1] {
    yresult = y[2]
}else if y[0] == y[2]{
    yresult = y[1]
}else{
    yresult = y[0]
}
print("\(xresult) \(yresult)")