c-gcc, 118 bytes

Result

WA

Duration

622ms

Code [DL]

main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}

stdin

x6c6z8h6t8t2c8u6f4x2w6l7q9a5k9x7e5m6y3s5k8e9a7i5nx9s4k4v2u8d5g8x7d2m2pxcj3jy9t8b5o7t4n3f2p8kr5

stdout

stderr

/tmp/code.c:1:1: warning: return type defaults to 'int' [-Wimplicit-int]
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
 ^~~~
/tmp/code.c: In function 'main':
/tmp/code.c:1:20: error: 'b' undeclared (first use in this function)
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                    ^
/tmp/code.c:1:20: note: each undeclared identifier is reported only once for each function it appears in
/tmp/code.c:1:22: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                      ^~~~~
/tmp/code.c:1:22: warning: incompatible implicit declaration of built-in function 'scanf'
/tmp/code.c:1:22: note: include '<stdio.h>' or provide a declaration of 'scanf'
+#include <stdio.h>
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                      ^~~~~
/tmp/code.c:1:28: error: expected expression before '%' token
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                            ^
/tmp/code.c:1:35: error: 'c' undeclared (first use in this function)
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                                   ^
/tmp/code.c:1:37: error: 'd' undeclared (first use in this function)
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                                     ^
/tmp/code.c:1:36: warning: left-hand operand of comma expression has no effect [-Wunused-value]
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                                    ^
/tmp/code.c:1:98: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
                                                                                                  ^~~~~~
/tmp/code.c:1:98: warning: incompatible implicit declaration of built-in function 'printf'
/tmp/code.c:1:98: note: include '<stdio.h>' or provide a declaration of 'printf'
/tmp/code.c:1:13: warning: variable 'i' set but not used [-Wunused-but-set-variable]
 main(){char i[101];b=scanf(%s,&i);c,d;for(d=b;b;b--)if(i[d-b]-48>9)for(c=i[d-b-1]-48<=9?:1;c;c--)printf("%c",i[d-b]);}
             ^
/root/script: line 7: /tmp/code: not found
rm: can't remove '/tmp/code': No such file or directory

strace