def take.digits
import yaml-for-bend@0.1.1.0/num.bend as Numimport Base
116def take.digits(s: String) -> String:
117 match s:
118 case SNil{}:
119 ""
120 case SCon{+c, t}:
121 when(String, Char.is_digit(c), u => SCon{c, take.digits(t)}, u => "")