Chess board tour

n, m = [int(x) for x in input().split()]

if (n*m)%2 == 1:
    print(-1)
else:
    res = ""
    i = 1
    j = 1
    if n%2 == 0 and m%2 == 0:
        while i < m:
            res += "R"
            i += 1
        while j < n:
            res += "D"
            j += 1
            while i > 2:
                res += "L"
                i -= 1
            res += "D"
            j += 1
            while i < m:
                res += "R"
                i += 1
        res += "L"
        i -= 1
        while j > 1:
            res += "U"
            j -= 1
    else:
        while i < m:
            res += "R"
            i += 1
        while j < n:
            res += "D"
            j += 1
        while i > 2:
            res += "L"
            i -= 1
            while j > 2:
                res += "U"
                j -= 1
            res += "L"
            i -= 1
            while j < n:
                res += "D"
                j += 1
        res += "L"
        i -= 1
        while j > 1:
            res += "U"
            j -= 1

    print(res)

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: ACCEPTED

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: ACCEPTED

Test 12

Verdict: WRONG ANSWER

Test 13

Verdict: ACCEPTED

Test 14

Verdict: WRONG ANSWER

Test 15

Verdict: ACCEPTED

Test 16

Verdict: WRONG ANSWER

Test 17

Verdict: WRONG ANSWER

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: WRONG ANSWER

Test 21

Verdict: WRONG ANSWER

Test 22

Verdict: ACCEPTED

Test 23

Verdict: WRONG ANSWER

Test 24

Verdict: WRONG ANSWER

Test 25

Verdict: ACCEPTED

Test 26

Verdict: WRONG ANSWER

Test 27

Verdict: WRONG ANSWER

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: WRONG ANSWER

Test 31

Verdict: ACCEPTED

Test 32

Verdict: ACCEPTED

Test 33

Verdict: WRONG ANSWER

Test 34

Verdict: ACCEPTED

Test 35

Verdict: WRONG ANSWER

Test 36

Verdict: ACCEPTED

Test 37

Verdict: ACCEPTED

Test 38

Verdict: WRONG ANSWER

Test 39

Verdict: WRONG ANSWER

Test 40

Verdict: ACCEPTED

Test 41

Verdict: WRONG ANSWER

Test 42

Verdict: WRONG ANSWER

Test 43

Verdict: ACCEPTED

Test 44

Verdict: ACCEPTED

Test 45

Verdict: ACCEPTED

Test 46

Verdict: WRONG ANSWER

Test 47

Verdict: TIME LIMIT EXCEEDED

Test 48

Verdict: TIME LIMIT EXCEEDED

Test 49

Verdict: ACCEPTED

Test 50

Verdict: WRONG ANSWER

Test 51

Verdict: TIME LIMIT EXCEEDED

Test 52

Verdict: ACCEPTED

Test 53

Verdict: TIME LIMIT EXCEEDED

Test 54

Verdict: WRONG ANSWER

Test 55

Verdict: WRONG ANSWER

Test 56

Verdict: WRONG ANSWER