Task 2 done.

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+#!raku
+
+# Task 2
+# You are given a digit string $S. Write a script to print all possible letter combinations that the given digit string could represent.
+
+
+sub MAIN( Str $S ) {
+    my %letters =
+    1 => [ '_', ',', '@' ]
+    , 2 => [ 'A', 'B', 'C' ]
+    , 3 => [ 'D', 'E', 'F' ]
+    , 4 => [ 'G', 'H', 'I' ]
+    , 5 => [ 'J', 'K', 'L' ]
+    , 6 => [ 'M', 'N', 'O' ]
+    , 7 => [ 'P', 'Q', 'R', 'S' ]
+    , 8 => [ 'T', 'U', 'V' ]
+    , 9 => [ 'W', 'X', 'Y', 'Z' ];
+
+    my @combinations;
+    for $S.comb  -> $current {
+        @combinations.push( %letters{ $current } ) if %letters{ $current }:exists;
+    }
+
+    ( [X] @combinations ).join( "\n" ).lc.say;
+}