n = int(input())
from collections import defaultdict
d = defaultdict(int)
for _ in range(n):
    s = list(input())
    if s != sorted(s):
        continue
    d_k = list(d.keys())
    for k in d_k:
        if s[0] < k:
            pass
        else:
            d[s[-1]] = max(d[k] + len(s),d[s[-1]])
    d[s[-1]] = max(len(s),d[s[-1]])        
print(max(d.values()))