#include<bits/stdc++.h>
using namespace std;
#define el "\n"
#define ll long long
#define ull unsigned long long
#define se second
#define fi first
#define be begin()
#define en end()
#define Faster cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(0);
 
int Count(char c1, char c2)
{
    if(c1 >= 'A' && c1 <='Z') c1 -= 'A' - 'a';
    if(c2 >= 'A' && c2 <='Z') c2 -= 'A' - 'a';
    if(abs(c1 - c2) <= 1) return 0;
    else return c1 - c2 - 1;
}
int main()
{
    Faster;
    char a, b; cin >> a >> b;
    cout << Count(a,b);
    return 0;
}
 

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