HDU 1720

#include<iostream>#include<cstring>using namespace std;int main(){   char a[20],b[20];   while(cin>>a>>b)   {     int sum1=0,sum2=0,sum=0;     int t;     int lengh1=strlen(a);     int lengh2=strlen(b);     for(int i=0;i<lengh1;i++)     {          if(a[i]<='9')         t=a[i]-'0';       else       {         a[i]=toupper(a[i]);         t=a[i]-'A'+10;}     sum1=sum1*16+t;       }         for(int j=0;j<lengh2;j++)  {  if(b[j]<='9')  t=b[j]-'0';else{b[j]=toupper(b[j]);t=b[j]-'A'+10;}      sum2=sum2*16+t;  }      cout<<sum1+sum2<<endl;          }   return 0;}