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int main() { int t; cin>>t; while(t--){ string s; cin>>s; int n = s.size(); if(n%2!=0) cout<<-1<<endl; else{ int sum = 0; int arr1[26] = {0}; for(int i=0;i<(n/2);i++){ arr1[s[i]-'a']++; } for(int i=(n/2);i<n;i++){ arr1[s[i]-'a']--; } for(int i=0;i<26;i++){ if(arr1[i]>0) sum = sum+arr1[i]; } cout<<sum<<endl;} } return 0; }
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