#include<stdio.h>
int main()
{
int a,b,c;
while(scanf("%d",&a)!=EOF){
scanf("%d %d",&b,&c);
if(a>b && b<=c)printf(":)\n");
else if(a<b && b>=c)printf(":(\n");
else if(a<b && b<c && (b-a)>(c-b))printf(":(\n");
else if(a<b && b<c && (b-a)<=(c-b))printf(":)\n");
else if(a>b && b>c && (a-b)>(b-c))printf(":)\n");
else if(a>b && b>c && (a-b)<=(b-c))printf(":(\n");
else if(a==b){
if(b<c)printf(":)\n");
else printf(":(\n");
}
}
return 0;
}
int main()
{
int a,b,c;
while(scanf("%d",&a)!=EOF){
scanf("%d %d",&b,&c);
if(a>b && b<=c)printf(":)\n");
else if(a<b && b>=c)printf(":(\n");
else if(a<b && b<c && (b-a)>(c-b))printf(":(\n");
else if(a<b && b<c && (b-a)<=(c-b))printf(":)\n");
else if(a>b && b>c && (a-b)>(b-c))printf(":)\n");
else if(a>b && b>c && (a-b)<=(b-c))printf(":(\n");
else if(a==b){
if(b<c)printf(":)\n");
else printf(":(\n");
}
}
return 0;
}
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