toI(s=readline()) = parse(Int,s)
toVI(s=readline()) = parse.(Int,split(s))
rep(f,n) = [f() for _ in 1:n]
@enum YN Yes=1 No=0

function main()
    h,w = toVI()
    solver(h,w)
end

function solver(h,w)
    mat = ['O' 'O' 'X' 'X'; 'X' 'X' 'O' 'O']
    res = Matrix{Char}(undef,w,h)
    for i in 1:h
        for j in 1:w
            mat[mod1(i,2),mod1(j,4)] |> print
        end
        print("\n")
    end
end

@static if endswith(@__FILE__, PROGRAM_FILE)
    main()
end