def get_data():
    S = input().split("n")
    return S

def main():
    S = get_data()
    count = 0
    # print(S)
    if len(S) > 2:
        for i in range(len(S)-1):
            if S[i] != '':
               count += 1
    else :
        count = 1
    print(count)
        




if __name__=="__main__":
    main()