What is the output of the following code? 
 #include<stdio.h>
 void main() 
int s=0; 
while(s++<10)> 
# define a 10
 main() 
printf("%d..",a); 
foo();
 printf("%d",a);
 }
 void foo()
 { 
#undef a
#define a 50 


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