from operator import itemgetter
import sys
input = lambda: sys.stdin.readline().rstrip()
#INF = 10**18

N = int(input())
l = []
for i in range(N):
    S = input()
    for i in range(len(S)-1):
        if S[i] > S[i+1]:
            break
    else:
        l.append([S[0],S[-1],-len(S),S])
l.sort(key=itemgetter(0,1,2))

ans = 0
last = "a"
for s in l:
    if s[0] < last:
        continue
    else:
        ans -= s[2]
        last = s[1]
print(ans)