#include <stdio.h>
#include <stdlib.h>
main(){
int len,c;
randomize();
len=rand() % 255 + 1;
printf("\n");
while(len--){
switch(rand()%3){
case 0:c='A'+rand()%26;break;
case 1:c='a'+rand()%26;break;
case 2:c='0'+rand()%10;break;
}
printf("%c",c);
}
}
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