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map.c

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#include<stdio.h>

int map(char c)

{

if (c - 'a' >= 0 && c - 'a' < 26)

return 'a' + ((c - 'a' + 2) % 26);

else

return c;

}

int main(void)

{

int c;

while (scanf("%c", &c) != EOF) {

printf("%c", map(c));

}

return 0;

}