//Normal #define _GLIBCXX_DEBUG #define ll long long #include using namespace std; using Graph = vector>; void print(auto a){ cout << a; } void prints(auto a){ cout << a << " "; } void prints(){ cout << " "; } void printl(auto a){ cout << a << endl; } void printl(){ cout << endl; } void fix(int n){ cout << fixed << setprecision(n); } int main(){ string S; cin >> S; sort(S.begin(), S.end()); int A = S[0]-'0'; int B = S[2]-'0'; printl(B-A); return 0; }