mod = 10**9+7

def main():

    S = str(input())
    S = [ord(c)-ord('a') for c in S]
    n = len(S)
    dp = [[0, 0] for i in range(26)]
    #dp[c][0]: 最後がcの文字列の個数
    #dp[c][1]: 最後がcの文字列の連の和
    ans = 0
    for i, c in enumerate(S):
        if i == 0:
            dp[c][0] = 1
            dp[c][1] = 1
            continue
        nx = [[0, 0] for j in range(26)]
        nx[c][0] = 1
        nx[c][1] = 1
        # i番目の文字列を選ばない場合
        for j in range(26):
            nx[j][0] += dp[j][0]
            nx[j][0] %= mod
            nx[j][1] += dp[j][1]
            nx[j][1] %= mod
        # i番目の文字列を選ぶ場合
        for j in range(26):
            if j == c:
                nx[j][0] += dp[j][0]
                nx[j][0] %= mod
                nx[j][1] += dp[j][1]
                nx[j][1] %= mod
            else:
                nx[c][0] += dp[j][0]
                nx[c][0] %= mod
                nx[c][1] += dp[j][0]+dp[j][1]
                nx[c][1] %= mod
        dp = nx
    ans = 0
    for j in range(26):
        ans += dp[j][1]
        ans %= mod
    print(ans)

if __name__ == '__main__':
    main()