/*
* TRGRID.cpp
*
* Created on: Jun 5, 2014
* Author: Arpit Bhayani
*/
#include <cstdio>
#include <cstdlib>
#include <iostream>
using namespace std;
#define DEBUG 0
#define gc getchar
#define ll long long
void scanint(ll int &x) {
register ll int c = gc();
x = 0;
for (; (c < 48 || c > 57); c = gc())
;
for (; c > 47 && c < 58; c = gc()) {
x = (x << 1) + (x << 3) + c - 48;
}
}
int readline(char * str) {
int i = 0;
char ch;
while ((ch = getchar()) != '\n') {
str[i++] = ch;
}
str[i] = '\0';
return i;
}
int main(int argc, char * argv[]) {
int t, i, j;
long long int n, m;
scanf("%d", &t);
for (i = 1; i <= t; i++) {
scanf("%lld%lld", &n, &m);
if (n <= m) {
if (n % 2 == 0)
printf("L\n");
else
printf("R\n");
} else if (n > m) {
if (m % 2 == 0)
printf("U\n");
else
printf("D\n");
}
}
return 0;
}
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