program ABC058B
    implicit none
    integer(8)::i
    character(50)::O,E
    character(100)::L
    read(5,*)O,E

    do i=1,len_trim(O)+len_trim(E)
        if(mod(i,2)==1)then
            L(i:i)=O(i/2+1:i/2+1)
        else
            L(i:i)=E(i/2:i/2)
        end if
    end do

    print'(A)',L(1:len_trim(O)+len_trim(E))
end program ABC058B