def main():
    import sys
    input = sys.stdin.read().split()
    idx = 0
    N = int(input[idx])
    idx += 1
    
    good_strings = []
    for _ in range(N):
        s = input[idx]
        idx += 1
        valid = True
        for i in range(1, len(s)):
            if s[i] < s[i-1]:
                valid = False
                break
        if valid:
            start = s[0]
            end = s[-1]
            s_idx = ord(start) - ord('a')
            e_idx = ord(end) - ord('a')
            good_strings.append((s_idx, e_idx, len(s)))
    
    dp = [0] * 26
    max_dp = [0] * 26
    
    for s_idx, e_idx, l in good_strings:
        current_max = max_dp[s_idx]
        candidate = current_max + l
        if candidate > dp[e_idx]:
            dp[e_idx] = candidate
        # Update max_dp
        current_max = 0
        for i in range(26):
            if dp[i] > current_max:
                current_max = dp[i]
            max_dp[i] = current_max
    
    print(max_dp[-1])

if __name__ == '__main__':
    main()