12901.kt

class Solution {
    fun solution(a: Int, b: Int): String {        
        val month = listOf(31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31)
        val dayOfWeek = listOf("FRI", "SAT", "SUN", "MON", "TUE", "WED", "THU")
        var diff = 0

        for (i in 0 until a - 1) {
            diff += month[i]
        }

        diff += (b - 1)

        return dayOfWeek[diff%7]
    }
}