Program seventh;
Var I:integer;
Begin
Readln(i);
If i=1 then writeln('It''s number one.')
else if (i>=10) and (i<20) then writeln('It''s tenth digit is 1.')
else if (i>=100) and (i<=199) then writeln('It''s hundredth digit is 1.')
else if (i>=1000) and (i<=1999) then writeln('It''s thousandth digit is 1.')
else writeln('It''s greater than 1999 or it isn''t start with 1.');
End.