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shui#include <stdio.h>
#include <string.h>
int main() {
char A[233],B[233];
scanf("%s%s",A,B);
int a=strlen(A),b=strlen(B);
int r=0;
for(int i=0;i<a;i++){
for(int j=0;j<b;j++){
r+=(A[i]-'0')*(B[j]-'0');
}
}
printf("%d\n",r);
return 0;
}
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