SUM3

k = 15
n = 9838
f0 = open('a.txt','r')
f = open('c.txt','w')
s = [line.strip('\n') for line in f0.readlines()]

def sum3(ss,nn):		
		oo = [[ss[i]+ss[j] for j in range(i)] for i in range(nn)]
		for i in range(nn):
				probe = 0
				string = ''
				m=ss[i]*(-1)
				new = oo[0:i]+oo[i+1:]
				for j in new:
						test = []
						tt=[]
						if m in j:
							probe = 1
							tt=[i+1,oo.index(j)+1,j.index(m)+1]
							tt.sort()

							for item in tt:
								string+= str(item)+' '
							return string

		if probe == 0:
				return -1


for i in range(k):
		s[i] = map(int,s[i].split())
		f.write(str(sum3(s[i],n))+'\n')

f0.close()
f.close()