#include <stdio.h>
#include<stdbool.h>
main(){
int sum1=0, sum2=0;
bool many11=false;
int i,count=1;
while(scanf("%d",&i
)!=EOF
){ if(count%2==1){
sum1+=i;
count++;
}
else{
sum2+=i;
count++;
}
}
many11=((sum1-sum2)%11==0);
return 0;
}
I2luY2x1ZGUgPHN0ZGlvLmg+CiNpbmNsdWRlPHN0ZGJvb2wuaD4KCm1haW4oKXsKCWludCBzdW0xPTAsIHN1bTI9MDsKCWJvb2wgbWFueTExPWZhbHNlOwoJaW50IGksY291bnQ9MTsKCXdoaWxlKHNjYW5mKCIlZCIsJmkpIT1FT0YpewoJCWlmKGNvdW50JTI9PTEpewoJCXN1bTErPWk7CgkJY291bnQrKzsKCQl9CgkJZWxzZXsKCQlzdW0yKz1pOwoJCWNvdW50Kys7CgkJfQoJfQoJbWFueTExPSgoc3VtMS1zdW0yKSUxMT09MCk7CglwcmludGYoIiVkIixtYW55MTEpOwoJcmV0dXJuIDA7Cn0K