#include<stdio.h>
int countdig(int n,int c){
while(n != 0){
c++;
n /= 10;
}
return c;
}
void dectohex(int n){
while(n > 0){
int rem = n % 16;
if(rem > 9){
int diff = rem - 10;
char ans = 'A' + diff;
printf("%c",ans);
}
else printf("%d",rem);
n /= 16;
}
}
int main(){
int n,c,alt;
scanf("%d",&n);
dectohex(n);
return 0;
}
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