func_code_string:         #include<bits/stdc++.h>           using namespace std;              #define ios ios_base::sync_with_stdio(false);cin.tie(NULL);           #define ll long long int           #define max3(a,b,c) max(max((a),(b)),(c))           #define max4(a,b,c,d) max(max((a),(b)),max((c),(d)))           #define min3(a,b,c) min(min((a),(b)),(c))           #define min4(a,b,c,d) min(min((a),(b)),min((c),(d)))           #define all(v) v.begin(),v.end()           #define rall(v) v.rbegin(),v.rend()           typedef pair<int,int> pii;           typedef pair<ll,ll> pll;           const long double PI = 3.14159265358979323846264338;           const long long INF = 1000000000000000000;           const long long INF1 = 1000000000;           const long long MOD = 1000000007;       //    int v[INF],m[INF];           ll fun(ll n){      int b=0;      while(n>0){          b+=n%10;          n/=10;      }      return b;    }           int main(){         ios         int t;         cin>>t;         while(t--){         ll n;         cin>>n;         if(n%2050==0){                 ll sum=n/2050;                 ll ans = fun(sum);                 cout<<ans<<endl;         }         else{             cout<<-1<<endl;         }                  }   }   