2016/5a.c


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#include <stdio.h>
#include <stdbool.h>
#include <openssl/md5.h>

int main(void){
	int counter=0;
	char inbuf[100];
	unsigned char outbuf[16];
	int prelen;
	scanf("%s%n",inbuf,&prelen);

	for(int i=0;i<8;i++){
		while(true){
			int len=prelen+sprintf(inbuf+prelen,"%d",counter);
			counter++;
			MD5((const unsigned char*)inbuf,len,outbuf);
			if(outbuf[0]==0&&outbuf[1]==0&&(outbuf[2]>>4)==0){
				putchar("0123456789abcdef"[outbuf[2]&0xf]);
				fflush(stdout);
				break;
			}
		}
	}
	putchar('\n');
}