#include <cstdio>
#include <cstring>
int main(int argc, char* argv[])
{
size_t len = strlen(argv[0]);
for (size_t i = 0; i < len/2; i++) { char t = argv[0][i]; argv[0][i] = argv[0][len-i-1]; argv[0][len-i-1] = t; }
printf("%s\n", argv[0]);
}
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