void main()
{
char string[]=  "Write_A25_3_5_HZ";
char *array[10];
int i=0;

array[i] = strtok(string,"_");

while(array[i]!='\0')
{
   array[++i] = strtok('\0',"_");
}
 for (i = 0; i < 5; ++i) 
        printf("%s\n", array[i]);
}

Write
A25
3
5
HZ