Submission #1864851

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Source Code Expand

import sys
DAYDREAM = ["dream", "dreamer", "erase", "eraser" ]
S = input()
#print("len(S):", len(S), file=sys.stderr)

ind = 0
res = True

while ind < len(S):
	ok = False
	for i in DAYDREAM:
		for j in DAYDREAM:
			curr = i + j
			
			if S[ind:ind+len(i+j)] == curr:
				ok = True
				ind += len(i)
				break
		if ok == True:
			break

	if ok == False:
		for i in DAYDREAM:
			if S[ind:ind+len(i)] == i:
				ok = True
				ind += len(i)
				break


	if ok == False:
#		print("ok is False, index: ", ind, file=sys.stderr)
		res = False
		break

print("YES" if res == True else "NO")	

Submission Info

Judge Result