source_code: //package codeforces;
  import java.util.Scanner;
  public class ex5 {
  public static void main(String[] args) {
  	Scanner scan = new Scanner(System.in);
  	String S [] = new String[3];
  	
  	int m=0,s=0,p=0;
  	int temp=0;
  	
  	for (int i = 0; i < S.length; i++) {
  		S[i]=scan.next();
  		if(S[i].indexOf('m')!=-1) m++;
  		if(S[i].indexOf('s')!=-1) s++;
  		if(S[i].indexOf('p')!=-1) p++;
  	}
  	
  	
  	int n1 = Integer.parseInt(S[0].substring(0,1));
  	int n2 = Integer.parseInt(S[1].substring(0,1));
  	int n3 = Integer.parseInt(S[2].substring(0,1));
  	
  	
  	
  	    int d3 = Math.abs(n1-n2);
  		int d4 = Math.abs(n1-n3);
  		int d5 = Math.abs(n2-n3);
  		
  	
  	if(m==3||s==3||p==3) {
  		
  		    if(d3==1&d5==1&d4==2||d3==1&d4==1&d5==2||d5==1&d4==1&d3==2)
  			System.out.println(0);
  		else 
  		    if(d3==0&d4==0) System.out.println(0);
  		else 
  			if(d3<d5&d3<d4) {
  			    if(d3==1||d3==2||d3==0) System.out.println(1);
  		        else                 System.out.println(2);
  			    }
  			else if (d5<d4&d5<d3){
  				 if(d5==1||d5==2||d5==0) System.out.println(1);
  					else                 System.out.println(2);
  			}
  			else if(d4<d5&d4<d3) {
  				if(d4==1||d4==2||d4==0) System.out.println(1);
  				else                 System.out.println(2);
  			}
  			else if(d3==2&d5==2||d4==2&d5==2||d3==2&d4==2||d3==1&d5==1||d4==1&d5==1||d3==2&d4==1)
  				System.out.println(1);
  			else System.out.println(2);
  			
  			
  		
  		 
  		    
  		    
  	}
  	
  	if(m==2||s==2||p==2) {
  		
  		
  		
  		char c1 = S[0].charAt(1);
  		char c2 = S[1].charAt(1);
  		char c3 = S[2].charAt(1);
  		
  		
  		if(c1==c2) {
  			if(n1==n2) System.out.println(1);
  			else if(d3==1||d3==2) System.out.println(1);
  			else System.out.println(2);
  		}
  		if(c1==c3) {
  			if(n1==n3) System.out.println(1);
  			else if(d4==1||d4==2) System.out.println(1);
  			else System.out.println(2);
  		}
  		if(c2==c3) {
  			if(n2==n3) System.out.println(1);
  			else if(d5==1||d5==2) System.out.println(1);
  			else System.out.println(2);
  		}
  	}
  	
  	if(m==1&s==1&p==1) System.out.println(2);
  		
  	
  	
  }
  }
  