def superFunctionalStrings(s):
    sss = []
    sum_= 0
    for i in range(len(s)):
        for j in range(i+1,len(s)+1):
            if s[i:j] not in sss:
                sss.append(s[i:j])
                sum_ += (len(s[i:j])**len(set(list(s[i:j]))))%(1000000007)
    return(sum_%(1000000007))