I wrote the source code for a new application on IOS, when writing there were no errors, but when I ran the code, an error appeared in this place:
var t = readLine()!
var s = readLine()!
var len_s = s.count
var t_lis = Set(t)
var c_s = Counter(s)
var c_t = Counter(t_lis[len_s])
var c_res =...