N = int(input()) 
if N == 1:
    print("No")
    import sys
    sys.exit()
S = input()
li = list(S)
z = (0 if S[0] == "o" else 1)
ans = []
l = ord("A")
for i in S:
    if z:
        z = 0
    else:
        z = 1
    if l != ord(i):
        if z:
            z = 0
        else:
            z = 1
    ans.append("R" if z == 1 else "L")
    l = ord(i)
print("Yes")	
print("".join(ans))