#!/usr/bin/env raku use v6.d; grammar G_24_02_a { token TOP { <report>+ } token report { <level>+ \v? } token level { <value> \h? } token value { <digit>+ } } my $input = chomp q:to/INPUT/; 77 6 4 2 1 1 2 7 8 9 9 7 6 2 1 1 3 2 4 5 8 6 4 4 1 12 3 99 INPUT say G_24_02_a.parse($input); dd $input