module md
contains
end module
module djset_md
    type DJSet
        integer::n
        integer,allocatable::upper(:)
    end type

contains
    subroutine build(o,n_)
        type(DJSet)::o
        integer::n_
        o%n=n_
        allocate(o%upper(o%n))
        do i=1,o%n
            o%upper(i)=-1
        end do
    end subroutine

    recursive function root(o,x)result(res)
        implicit none
        type(DJSet)::o
        integer::x,res
        if(o%upper(x)<0)then
            res=x
        else
            o%upper(x)=root(o,o%upper(x))
            res=o%upper(x)
        end if
    end function

    subroutine setUnion(o,x,y)
        integer::x,y
        type(DJSet)::o
        x=root(o,x)
        y=root(o,y)
        if(x==y)return
        if(o%upper(x)<o%upper(y).or.(o%upper(x)==o%upper(y).and.x<y))then
            x=xor(x,y)
            y=xor(x,y)
            x=xor(x,y)
        end if
        !yの方が強い集団
        o%upper(y)=o%upper(x)+o%upper(y)
        o%upper(x)=y
    end subroutine



end module

program main
    use djset_md
    implicit none
    integer::n,m,i,j,k,a,b
    type(DJSet)::ds
    read(*,*)n,m
    call build(ds,n)
    do i=1,m
        read(*,*)a,b
        call setUnion(ds,a,b)
    end do
    do i=1,n
        print*,root(ds,i)
    end do
end program