на строке if выдаёт ошибку: ожидался порядковый тип

Program gr;
var s: string;gr1, i:integer;
begin
readln(s);gr1:=0;i:=1;
if s[i] in ['1'..'10'] then
begin
gr1:=gr+1;
i:=i+1;
end;
end.
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