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()
    res = solve(h,w)
    for col in eachcol(res)
        join(col) |> println
    end
end

function solve(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
            res[j,i] = mat[mod1(i,2),mod1(j,4)]
        end
    end
    return res
end

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