### BUGGY CODE ###

mod = 1000000007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    S = []
    for _ in range(N):
        s = input().rstrip('\n')
        S.append(s[::-1])

    S.sort(key=lambda s: len(s), reverse=True)
    cnt = []
    for s in S:
        c = [0] * 26
        for ss in s:
            c[ord(ss) - 97] += 1
        cnt.append(c)
    ans = 0
    for L in range(1, 10**6+1):
        if not S:
            break
        M = len(S)
        key = []
        i = M-1
        while i >= 0:
            if len(S[i]) == L:
                s = S.pop()
                cnt.pop()
                key.append(s)
            else:
                if L > 1:
                    ss = S[i][L-2]
                    cnt[i][ord(ss) - 97] -= 1
            i -= 1
        for s in key:
            pre = s[:-1]
            last = ord(s[-1]) - 97
            if L == 1:
                for i in range(len(cnt)):
                    if cnt[i][last] > 0:
                        ans += 1
            else:
                for i in range(len(cnt)):
                    if cnt[i][last] > 0 and S[i][:L-1] == pre:
                        ans += 1
        # print(S, L, ans)
    print(ans)


if __name__ == '__main__':
    main()


### FIXED CODE ###

mod1 = 1000000007
mod2 = 1000000009
base1 = 2009
base2 = 1007
eps = 10**-9


def main():
    import sys
    input = sys.stdin.readline

    N = int(input())
    S = []
    for _ in range(N):
        s = input().rstrip('\n')
        S.append(s[::-1])

    S.sort(key=lambda s: len(s), reverse=True)
    cnt = []
    for s in S:
        c = [0] * 26
        for ss in s:
            c[ord(ss) - 97] += 1
        cnt.append(c)
    ans = 0
    H1 = [0] * N
    H2 = [0] * N
    for L in range(1, 10**6+1):
        if not S:
            break
        M = len(S)
        key = []
        i = M-1
        dic_last = {}
        while i >= 0:
            if len(S[i]) == L:
                s = S.pop()
                cnt.pop()
                h1 = H1.pop()
                h2 = H2.pop()
                if L > 1:
                    last = ord(s[L-2]) - 97
                    h1 = (h1 * base1 + last)%mod1
                    h2 = (h2 * base2 + last)%mod2
                key.append((s, h1, h2))
            else:
                if L > 1:
                    ss = ord(S[i][L-2]) - 97
                    cnt[i][ss] -= 1
                    H1[i] = (H1[i] * base1 + ss)%mod1
                    H2[i] = (H2[i] * base2 + ss)%mod2
                    hh = H1[i] * (mod2+1) + H2[i]
                    if hh not in dic_last:
                        dic_last[hh] = [0] * 26
                    for j in range(26):
                        if cnt[i][j] > 0:
                            dic_last[hh][j] += 1
            i -= 1
        for s, h1, h2 in key:
            last = ord(s[-1]) - 97
            h = h1 * (mod2+1) + h2
            if L == 1:
                for i in range(len(cnt)):
                    if cnt[i][last] > 0:
                        ans += 1
            else:
                if h in dic_last:
                    ans += dic_last[h][last]
        #print(L, S, ans)
    print(ans)


if __name__ == '__main__':
    main()