// input code here
``` #include <iostream>
#include<cstring>
using namespace std;
int max(int a, int b)
{
    if (a >= b)
        return a;
    else
        return b;
}
int pd(char a[], char b[])
{
    int lena = strlen(a), lenb = strlen(b), num = 1;
    if (lena >= lenb)
    {
        for (int i = 0; i < lenb; i++)
        {
            if (a[i] != b[i])
            {
                num = 0; break;
            }
        }
    }
    else
    {
        for (int i = 0; i < lena; i++)
        {
            if (a[i] != b[i])
            {
                num = 0; break;
            }
        }
    }
    if (num == 1)
        return 2;
    else
        return 1;

}
int main()
{
    
    int n, dp[2005], maxn, max1 = -1;
    char ch[2005][75];
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> ch[i];
    } 
    dp[1] = 1;
    for (int i = 2; i <= n; i++)
    {
        maxn = -1;
        for (int j = 1; j < i; j++)
        {
            if (pd(ch[j], ch[i]) == 2)
            {
                maxn = max(maxn, dp[j]);
            }
            
        }dp[i] = maxn + 1;
    }
    for (int i = 1; i <= n; i++)
    {
        max1 = max(max1, dp[i]);
    }
    cout << max1<< endl;
    return 0;
}