c-gcc, 50 bytes

Result

WA

Code [DL]

char s[1];main(){gets(s),100,1,strcmp();puts(s);}

stdin

5456544667008235146330604045170424879595401067382866874110254132760834630920931199286208651240056424

stdout

5456544667008235146330604045170424879595401067382866874110254132760834630920931199286208651240056424

stderr

/tmp/code.c:1:11: warning: return type defaults to ‘int’ [-Wimplicit-int]
 char s[1];main(){gets(s),100,1,strcmp();puts(s);}
           ^
/tmp/code.c: In function ‘main’:
/tmp/code.c:1:18: warning: implicit declaration of function ‘gets’ [-Wimplicit-function-declaration]
 char s[1];main(){gets(s),100,1,strcmp();puts(s);}
                  ^
/tmp/code.c:1:25: warning: right-hand operand of comma expression has no effect [-Wunused-value]
 char s[1];main(){gets(s),100,1,strcmp();puts(s);}
                         ^
/tmp/code.c:1:32: warning: implicit declaration of function ‘strcmp’ [-Wimplicit-function-declaration]
 char s[1];main(){gets(s),100,1,strcmp();puts(s);}
                                ^
/tmp/code.c:1:29: warning: right-hand operand of comma expression has no effect [-Wunused-value]
 char s[1];main(){gets(s),100,1,strcmp();puts(s);}
                             ^
/tmp/code.c:1:31: warning: right-hand operand of comma expression has no effect [-Wunused-value]
 char s[1];main(){gets(s),100,1,strcmp();puts(s);}
                               ^
/tmp/code.c:1:41: warning: implicit declaration of function ‘puts’ [-Wimplicit-function-declaration]
 char s[1];main(){gets(s),100,1,strcmp();puts(s);}
                                         ^
/tmp/ccAJDsNG.o: In function `main':
code.c:(.text.startup+0xc): warning: the `gets' function is dangerous and should not be used.

strace