35 lines
858 B
C
35 lines
858 B
C
#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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int main(void){
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char string[8192], r_string[8192];
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gets(r_string);
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int len = strlen(r_string);
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for(int i = 0; i < len; i++){
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if((r_string[i] >= 'a' && r_string[i] <= 'z') || (r_string[i] >= 'A' && r_string[i] <= 'Z'))
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string[i] = tolower(r_string[i]);
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else string[i] = '#';
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}
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string[len]='\0';
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int tail = len - 1, mtl = tail;
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int i, mi, max = 0, k, mk, tk = 0, ti = 0;
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for(i = 0; i < len; i++){
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k = tail;
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for(k = tail; k > i; k--){
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mk = k;
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mi = i;
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do{
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if(string[mi] != string[mk]) break;
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while(string[++mi] == '#');
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while(string[--mk] == '#');
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}while(mk > mi && string[mi] == string[mk]);
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if(mk <= mi && k - i > max) tk = k, ti = i, max = k - i;
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}
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}
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if(tk - ti >= 0)
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for(i = ti; i <= tk; i++) printf("%c",r_string[i]);
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printf("\n");
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return 0;
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}
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