var
  s1,s2 : string;
  d1,d2 : longint;
  c1,c2 : char;
begin
  readln(s1);
  readln(s2);
  readln(d1);
  readln(d2);
  readln(c1);
  readln(c2);
  s1[d1]=c1.
  s2[d2]=c2.
  writeln(s1);
  writeln(s2);
end.