import sys

def count_long(input_str):
    tem_list=[]
    tem_list = input_str.split()
    for val in tem_list:
        if val:
            continue
        else:
            return("单词不能为空")

    last_str = tem_list.pop()
    return len(last_str)

if __name__ == '__main__':
    input_str = input("")
    number=count_long(input_str)
    print(number)