str1=input()
max = "0"    # 存储值最大的数字
string = "" # 将连续的数字拼接起来
for i in range(1,len(str1)) :
    if str1[i-1].isdigit():
       string += str1[i-1]
    else:
       if string == "":
          continue;
       elif int(string) > int(max):
          max = string
          string = ""
print(str1.find(max) + 1)
/**************************************************************
	Problem: 1113
	User: admin
	Language: Python
	Result: Accepted
	Time:95 ms
	Memory:34480 kb
****************************************************************/