! 2020.2.9
!
      program answer
      implicit none
      integer :: n,i
      character(len=100) :: S
      character(len=100) :: S_x
!
      read(*,*) S
      n = len_trim(S)
      do i=1,n
        S_x(i:i) = 'x'
      end do
!
      write(*,*) S_x(1:n)
!
      end program answer