OJ Board

Hi, I am confused by the phrasing: "If multiple solutions are possible, print the first lexicographically." What does it mean here? For example, for the input: 1 10 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10 10 the accepted output is 1 2 3 4 5 6 7 8 9 10 However, my understanding of lexicograp...