links = eval(input())
arr=[]
arr1=[]
arr2=[]
arr4=[]
for i in range(0,len(links)):
  arr.append(0)
  arr1.append(0)
  arr2.append(0)

for i in range(0,len(links)):
  for g in range(0,len(links[i])):
    for f in range(0,len(links[links[i][g]])):
      arr[i]+=1
      #arr1[links[i][g]]+=1
      #arr2[links[links[i][g]][f]]+=1
#print(len(arr2),len(arr1),len(arr))
for i in range(0,len(links)):
  arr4.append(arr[i]+arr1[i]+arr2[i])
#print(arr4)
arr4[arr4.index(max(arr4))]=0
print(arr4.index(max(arr4)))