交错01串

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String s = scanner.next();
        int[] arr = new int[s.length()];
        arr[0] = 1;
        int result = 1;
        for (int i = 1; i < s.length(); i++) {
            if (s.charAt(i) == s.charAt(i-1)) {
                arr[i] = 1;
            } else {
                arr[i] = arr[i-1] + 1;
            }
            result = Math.max(arr[i], result);
        }
        System.out.println(result);
        scanner.close();
    }
}

n=input()
m=len(n)
n=int(n)
p=[]
for i in range(m):
    p.append(n%10)
    n=n//10
p.reverse()
t=[]
flag=1
for j in range(m-1):
    if abs(p[j+1]-p[j])==1:
        flag=flag+1
        t.append(flag)
    else:
        flag=1
        t.append(flag)
t.append(flag)
print(max(t))

	
	

		
		

			
			

				
				

					
					

						
						

							
							

								#coding=utf-8
							

							

								while1:
							

							

								    s=raw_input()
							

							

								    res=[]
							

							

								    count=0
							

							

								    fori inrange(len(s)):
							

							

								        ifi==0:
							

							

								            tmp=s[i]
							

							

								            pass
							

							

								        elifs[i]!=tmp:
							

							

								            count+=1
							

							

								            tmp=s[i]
							

							

								            pass
							

							

								        elifs[i]==tmp:
							

							

								            res.append(count)
							

							

								            count=0
							

							

								            tmp=s[i]
							

							

								    ifcount==len(s)-1:
							

							

								        print(count)+1
							

							

								        break
							

							

								    ifnotres:
							

							

								        print(0)
							

							

								        break
							

							

								    printmax(res)+1
							

							

								    break
							

						

					

				

			

		

	




	
	

		
	

print(max(l))