foo.c: In function 'Diff':
foo.c:8:30: error: expected expression before '<' token
    8 |                 if(s[i]>'A'&&<s[i]<'Z')CNT++
      |                              ^
foo.c:8:40: error: 'CNT' undeclared (first use in this function)
    8 |                 if(s[i]>'A'&&<s[i]<'Z')CNT++
      |                                        ^~~
foo.c:8:40: note: each undeclared identifier is reported only once for each function it appears in
foo.c:8:45: error: expected ';' before 'if'
    8 |                 if(s[i]>'A'&&<s[i]<'Z')CNT++
      |                                             ^
      |                                             ;
    9 |                 if(s[i]>'a'&&<s[i]<'z')cnt++
      |                 ~~                           
foo.c:11:21: error: 'cnt' undeclared (first use in this function); did you mean 'int'?
   11 |         int ret=CNT-cnt;
      |                     ^~~
      |                     int
foo.c: In function 'main':
foo.c:17:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   17 |         gets(s1);
      |         ^~~~
In file included from foo.c:1:
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~
foo.c:18:9: warning: 'gets' is deprecated [-Wdeprecated-declarations]
   18 |         gets(s2);
      |         ^~~~
/nix/store/linb70pgp53f0kygxm5wk163dx22d681-glibc-2.37-45-dev/include/stdio.h:605:14: note: declared here
  605 | extern char *gets (char *__s) __wur __attribute_deprecated__;
      |              ^~~~

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