Problem A. Aquatic life ≡

Statement

Scientists of Nearsea Institute of Underwater Life obtained a picture of the mysterious aquatic life form. They wanted to determine the creature's species.

To do that, picture copies were distributed among N experts. Each expert made G_i guesses, each guess consisting of the name of the species and the score s_ij reflecting expert's level of confidence in the guess. For each expert, all guesses name different species.

You program must choose the species which received the highest total score from all experts.

In the first sample below "Ceramaster_arcticus" species received the total score of 14.

Input file format

Input file contains integer N on the first line, followed by N line blocks — one for each expert.

Each line block contains integer G_i, on the first line, followed by G_i lines — one for each guess.

Each guess line contains an integer s_ij followed by a string — guess score and species name. Names consist of Latin letters and underscores (ASCII 95). Names are case-sensitive ("a" and "A" are different names).

Output file format

Output file must contain names of all species with the score equal to the highest total score, one name per line, sorted lexicographically.

Constraints

1 ≤ N ≤ 100, 1 ≤ G_i ≤ 100, 1 ≤ s_ij ≤ 100

Species names contain from 1 to 50 characters.

Sample tests

3
2
5 Ceramaster_patagonicus
5 Ceramaster_arcticus 
3
7 Neoferdina_insolita
1 Neoferdina_glyptodisca
1 Ceramaster_arcticus 
2
8 Ceramaster_arcticus
2 Neoferdina_insolita

Ceramaster_arcticus

2
3
5 a
6 b
1 c
2
3 a
7 c

a
c

1
4
13 a
7 b
13 B
9 A

B
a