Calculate Total Book Sales

You are given a list of sales records for books. Each record is represented as a triplet \( (\text{book\_id},\, \text{month\_of\_sale},\, \text{copies\_sold}) \). Your task is to calculate the total number of copies sold for each book across all months. Finally, output the results as a sorted list of pairs \( (\text{book\_id},\, \text{total\_copies\_sold}) \) in increasing order of book_id.

Note: All formulas are provided in LaTeX format.

inputFormat

The input is read from standard input (stdin) and has the following format:

• The first line contains an integer \( n \), representing the number of records.
• Each of the following \( n \) lines contains three space-separated integers: \( book\_id \), \( month\_of\_sale \), and \( copies\_sold \).

outputFormat

Print the results to standard output (stdout) in the following format:

• For each unique \( book\_id \), print a line containing two integers: the \( book\_id \) and the corresponding total copies sold.
• The output should be sorted in increasing order of \( book\_id \).

## sample

5
101 1 5
102 3 10
101 2 7
102 3 3
103 5 1

101 12
102 13
103 1

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