var
n1,n2:integer;
s1,s2,r:string;
begin
write('n1 n2: ');
readln(n1,n2);
write('1-я строка: ');
readln(s1);
write('2-я строка: ');
readln(s2);
delete(s1,n1+1, length(s1)-n1+1);
delete(s2,1, length(s2)-n2);
r:=s1+s2;
writeln(r);
readln;
end.