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#include<stdio.h>
#include<string.h>
int main(){
	String a,b;
	scanf("%[^\n]s",a);
	scanf("%[^\n]s",b);
	int alen,blen;
	alen=strlen(a);
	blen=strlen(b);
 
	printf("%d\n",alen);
	printf("%d\n",blen);
return 0;
}

prog.c: In function ‘main’:
prog.c:4:2: error: unknown type name ‘String’; did you mean ‘stdin’?
  String a,b;
  ^~~~~~
  stdin
prog.c:5:12: warning: format ‘%[^
   ’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  scanf("%[^\n]s",a);
         ~~~^~    ~
prog.c:6:12: warning: format ‘%[^
   ’ expects argument of type ‘char *’, but argument 2 has type ‘int’ [-Wformat=]
  scanf("%[^\n]s",b);
         ~~~^~    ~
prog.c:8:14: warning: passing argument 1 of ‘strlen’ makes pointer from integer without a cast [-Wint-conversion]
  alen=strlen(a);
              ^
In file included from prog.c:2:
/usr/include/string.h:384:35: note: expected ‘const char *’ but argument is of type ‘int’
 extern size_t strlen (const char *__s)
                       ~~~~~~~~~~~~^~~
prog.c:9:14: warning: passing argument 1 of ‘strlen’ makes pointer from integer without a cast [-Wint-conversion]
  blen=strlen(b);
              ^
In file included from prog.c:2:
/usr/include/string.h:384:35: note: expected ‘const char *’ but argument is of type ‘int’
 extern size_t strlen (const char *__s)
                       ~~~~~~~~~~~~^~~
prog.c:5:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%[^\n]s",a);
  ^~~~~~~~~~~~~~~~~~
prog.c:6:2: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%[^\n]s",b);
  ^~~~~~~~~~~~~~~~~~

Standard output is empty