생성일: 2022년 1월 22일 오후 6:04
# 증가수열 만들기 (그리디)
import sys
#sys.stdin = open("input2.txt", "rt")
n = int(input())
l = list(map(int, input().split()))
cnt = 0
res = ""
lastNum = 0
notFinished= True
while notFinished:
if l[0] > lastNum and l[-1] > lastNum:
if l[0] <= l[-1]:
lastNum = l[0]
l.pop(0)
res += "L"
else:
lastNum = l[-1]
l.pop()
res += "R"
cnt += 1
elif l[0] > lastNum and l[-1] <= lastNum:
lastNum = l[0]
l.pop(0)
cnt += 1
res += "L"
elif l[0] <= lastNum and l[-1] > lastNum:
lastNum = l[-1]
l.pop()
cnt += 1
res += "R"
else:
notFinished= False
print(cnt)
print(res)