#include
int main(int argc,char *argv[]){
int y,m,d,c[12]={31,28,31,30,31,30,31,31,30,31,30,31};
printf("Input y, m & d...\n");
while(1){
scanf("%d%d%d",&y,&m,&d);
c[1]=28+(y%4==0 && y%100 || y%400==0);
if(m>0 && m<13 && d>0 && d<=c[m-1])
break;
printf("Input error, redo: ");
}
printf("Your input is %d-%d-%d\n",y,m,d);
return 0;
}