1)var
n,n2,k:integer;
begin
readln(n);
k:=1000;
while n<>0 do
begin
n2:=n2+k*(n mod 10);
n:=n div 10;
k:=k div 10;
end;
writeln(n2);
end.
2)var
x,y:real;
begin
readln(x);
y:=sqrt(sqr(x)+1)-2*sqr(x)-3/5;
writeln(y);
end.
1*)//Pascal ABC. NET v3.0 сборка 1111
var
s:string;
begin
readln(s);
s.Reverse.Print('');
end.