This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <stdio.h>
#include <string.h>
#define L_MAX 101
#define MOD 26
int N, L;
char S[L_MAX+1];
int mod(int num) {
    while(num<0) num+=MOD;
    while(num>=MOD) num-=MOD;
    return num;
}
int main(void) {
    int i;
    scanf("%d",&N);
    while(scanf("%s",S)==1) {
        L=strlen(S);
        for(i=0 ; i<L ; i++) S[i]-='a';
        if(L%2) L--;
        for(i=0 ; i<L ; i+=2) printf("%c",mod(S[i]+S[i+1]-N)+'a');
        printf(" ");
    }
    return 0;
}
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