Encoded Love-letter

Time Limit : 1000/1000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other)
Total Submission(s) : 35   Accepted Submission(s) : 14
Problem Description
After Gardon had got Angel's letter, he found it was encoded...Oh my god, why did she encode a love-letter?? But don't worry, she wrote the algorithm for encoding after the letter: Each charactor are changed to a corresponding charactor. If the keyword is "Angel", the rule will be: ABCDEFGHIJKLMNOPQRSTUVWXYZ ANGELZYXWVUTSRQPOMKJIHFDCB You may find that in the bottom line, charactors of the keyword come first. All other charactors will come in a reversed order. Now given another keyword, work the letter out! Can you write a program to translate the letter?
 
Input
The letter will begin with the keyword (All uppercase), then lines of text.
 
Output
Decode the letter and print it out. Please note that a upper-case charactor will be decoded to a upper-case charactor, while a lower-case charactor will be decoded to a lower-case charactor.
 
Sample Input
ANGEL Fxlr jxaj eac W xlam cqim hqwgl W xahl kqsl kplgwat zlltwry Tlj sl atfack jxwru W eqr'j farra zqmylj cqi W mlslsnlm aj jxl eac Cqi aml atfack qr sc swre Lhlrjxqiyx W vikj gar jxwru anqij cqi Wz jxl eac wr jxl zijiml Jxwk tqhl fwtt nlgqswry jmil W'hl rlhlm gxaryl sc swre jxaj W fwtt tqhl cqi zqmlhlm W eqr'j gaml xqf zqqt wj wk W fwtt tlj sc emlas gqsl jmil W fwtt jltt cqi kqsljxwry W farra tlj cqi urqf, W tlj cqi urqf W tqhl cqi, tqhwry cqi, ak jxl sqikl tqhlk jxl mwgl Lhlr lhlmc eac xak kjqms, W fwtt atfack nc cqim kwel W swkk cqi, swkkwry cqi W eqr'j gaml xqf xame wj wk W vikj farj cqi jq nl xappc Lhlmcjxwry, W eq wj zqm cqi
 
Sample Output
When that day I hear your voice I have some special feeling Let me always think I don't wanna forget you I remember at the day You are always on my mind Eventhough I just can think about you If the day in the future This love will becoming true I've never change my mind that I will love you forever I don't care how fool it is I will let my dream come true I will tell you something I wanna let you know, I let you know I love you, loving you, as the mouse loves the rice Even every day has storm, I will always by your side I miss you, missing you I don't care how hard it is I just want you to be happy Everything, I do it for you
 
Author
DYGG
 
Source
HDU “Valentines Day” Open Programming Contest 2007-02-14

 #include <stdio.h>
#include <stdlib.h>
#include <string.h>
char c[];
int main()
{
int n,i,sign1,sign2,j,k;
char a[],b[];
gets(a);
sign1=strlen(a);
for(i=;i<;i++)
{
b[i]='A'+i;
b[i+]='a'+i;
}
for(i=;i<sign1;i++)
{
a[i+]=a[i]+;
}
for(i=sign1,j=;i<;i++,j++)
{
a[i]='Z'-j;
a[i+]='z'-j;
for(k=;k<sign1;k++)
if(a[i]==a[k])
{
i--;break;
}
}
while(gets(c))
{
sign2=strlen(c);
for(i=;i<sign2;i++)
{
if(c[i]>='A'&&c[i]<='Z')
for(k=;k<;k++)
if(c[i]==a[k])
{
c[i]=b[k];break;
}
if(c[i]>='a'&&c[i]<='z')
for(k=;k<;k++)
if(c[i]==a[k])
{
c[i]=b[k];break;
}
}
printf("%s\n",c);
}
return;
}

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