var
s:string;
i:integer;
temp:char;
begin
readln(s);
for i:=1 to length(s)-1 do
if odd(i) then
begin
temp:=s[i];
s[i]:=s[i+1];
s[i+1]:=temp
end;
writeln(s)
end.
var
s:string;
i:integer;
temp:char;
begin
readln(s);
for i:=1 to length(s)-1 do
if odd(i) then
begin
temp:=s[i];
s[i]:=s[i+1];
s[i+1]:=temp
end;
writeln(s)
end.