l=["abc", "bcd", "xyz"] 

def Sample00(x):
	for i in l:
		if str(x) in i:
			print(i)

Sample00('b')


r=[[1, 2, 3],[2, 3, 4],[9, 5, 19, 7, 9]]

def Sample11(x):
	for i in r:
		if x in i:
			print(i)

Sample11(3)


l=["abc", "bcd", "xyz"] 

def Sample22(x):
	for j in x:
		for i in l:
			if str(j) in i:
				print(i)

Sample22('ax')