input:

1000000
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
...

output:

-1
-1
1
-1
-1
2
-1
-1
3
-1
-1
4
-1
-1
5
-1
-1
6
-1
-1
7
-1
-1
8
-1
-1
9
-1
-1
10
-1
-1
11
-1
-1
12
-1
-1
13
-1
-1
14
-1
-1
15
-1
-1
16
-1
-1
17
-1
-1
18
-1
-1
19
-1
-1
20
-1
-1
21
-1
-1
22
-1
-1
23
-1
-1
24
-1
-1
25
-1
-1
26
-1
-1
27
-1
-1
28
-1
-1
29
-1
-1
30
-1
-1
31
-1
-1
32
-1
-1
33
-1
-1
34
-1
...

result:

wrong answer 4th lines differ - expected: '2', found: '-1'