7857번 - Simple prefix compression 다국어

문제

Many databases store the data in the character fields (and especially indices) using prefix compression. This technique compresses a sequence of strings A₁, ..., A_N by the following method: if there are strings A_i = a_i,1a_i,2...a_i,p and A_{i + 1} = a_i+1,1a_i+1,2...a_i+1,q such that for some j ≤ min(p, q) a_i,1 = a_i+1,1, a_i,2 = a_i+1,2, ... a_i,j = a_i+1,j, then the second string is stored as [j]a_i+1,j+1a_i+1,j+2... a_i+1,q, where [j] is a single character with code j.

If j = 0, that is, strings do not have any common prefix, then the second string is prefixed with zero byte, and so the total length actually increases.

입력

First line of input file contains integer number N, with following N lines containing strings A₁ ... A_N

출력

Output file must contain a single integer — minimal total length of compressed strings.

제한

• 1 ≤ N ≤ 10000, 1 ≤ length(A_i) ≤ 255.

힌트