diff --git a/day4/main.go b/day4/solution.go
similarity index 100%
rename from day4/main.go
rename to day4/solution.go
diff --git a/day5/main.kt b/day5/solution.kt
similarity index 100%
rename from day5/main.kt
rename to day5/solution.kt
diff --git a/day6/main.hs b/day6/solution.hs
similarity index 100%
rename from day6/main.hs
rename to day6/solution.hs